Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Religion in the Netherlands
Table title:
Table
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Most Protestants </th><th colspan=1 rowspan=1 > Roman Catholics </th><th colspan=1 rowspan=1 > Jews </th><th colspan=1 rowspan=1 > Muslims </th><th colspan=1 rowspan=1 > Other Christians /religions </th><th colspan=1 rowspan=1 > No religion/atheist </th></tr>
<tr> <td colspan=1 rowspan=1 > 1830 </td><td colspan=1 rowspan=1 > 59,1% </td><td colspan=1 rowspan=1 > 40.8% </td><td colspan=1 rowspan=1 > 1.8% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1840 </td><td colspan=1 rowspan=1 > 59,6% </td><td colspan=1 rowspan=1 > 40.3% </td><td colspan=1 rowspan=1 > 1.8% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1849 </td><td colspan=1 rowspan=1 > 59.7% </td><td colspan=1 rowspan=1 > 38.4% </td><td colspan=1 rowspan=1 > 1.9% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1859 </td><td colspan=1 rowspan=1 > 60.6% </td><td colspan=1 rowspan=1 > 37.4% </td><td colspan=1 rowspan=1 > 1.9% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1869 </td><td colspan=1 rowspan=1 > 61.3% </td><td colspan=1 rowspan=1 > 36.6% </td><td colspan=1 rowspan=1 > 1.9% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1879 </td><td colspan=1 rowspan=1 > 61.6% </td><td colspan=1 rowspan=1 > 36.1% </td><td colspan=1 rowspan=1 > 2.0% </td><td colspan=1 rowspan=1 > 0.0% </td><td colspan=1 rowspan=1 > 0.0% </td><td colspan=1 rowspan=1 > 0.3% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1889 </td><td colspan=1 rowspan=1 > 60.5% </td><td colspan=1 rowspan=1 > 35.6% </td><td colspan=1 rowspan=1 > 2.2% </td><td colspan=1 rowspan=1 > 0.0% </td><td colspan=1 rowspan=1 > 0.4% </td><td colspan=1 rowspan=1 > 1.5% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1899 </td><td colspan=1 rowspan=1 > 60.0% </td><td colspan=1 rowspan=1 > 35.3% </td><td colspan=1 rowspan=1 > 2.0% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 0.4% </td><td colspan=1 rowspan=1 > 2.3% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1909 </td><td colspan=1 rowspan=1 > 57.3% </td><td colspan=1 rowspan=1 > 35.2% </td><td colspan=1 rowspan=1 > 1.8% </td><td colspan=1 rowspan=1 > 0.0% </td><td colspan=1 rowspan=1 > 0.7% </td><td colspan=1 rowspan=1 > 5.0% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1920 </td><td colspan=1 rowspan=1 > 53.8% </td><td colspan=1 rowspan=1 > 35.8% </td><td colspan=1 rowspan=1 > 1.7% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1.0% </td><td colspan=1 rowspan=1 > 7.8% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1930 </td><td colspan=1 rowspan=1 > 46.3% </td><td colspan=1 rowspan=1 > 36.5% </td><td colspan=1 rowspan=1 > 1.4% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1.4% </td><td colspan=1 rowspan=1 > 14.4% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1947 </td><td colspan=1 rowspan=1 > 42.3% </td><td colspan=1 rowspan=1 > 38.6% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1.9% </td><td colspan=1 rowspan=1 > 17.1% </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1960 </td><td colspan=1 rowspan=1 > 40.7% </td><td class="highlighted"  colspan=1 rowspan=1 > 40.5% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 0.0% </td><td colspan=1 rowspan=1 > 0.2% </td><td colspan=1 rowspan=1 > 18.3% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1971 </td><td colspan=1 rowspan=1 > 35.9% </td><td colspan=1 rowspan=1 > 40.5% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 0.4% </td><td colspan=1 rowspan=1 > 0.3% </td><td colspan=1 rowspan=1 > 23.6% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1975 </td><td colspan=1 rowspan=1 > 33% </td><td colspan=1 rowspan=1 > 38% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 3% </td><td colspan=1 rowspan=1 > 26% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1977 </td><td colspan=1 rowspan=1 > 31% </td><td colspan=1 rowspan=1 > 38% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 3% </td><td colspan=1 rowspan=1 > 26% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1980 </td><td colspan=1 rowspan=1 > 30% </td><td colspan=1 rowspan=1 > 38% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 5% </td><td colspan=1 rowspan=1 > 26% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1983 </td><td colspan=1 rowspan=1 > 29% </td><td colspan=1 rowspan=1 > 36% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 6% </td><td colspan=1 rowspan=1 > 30% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1985 </td><td colspan=1 rowspan=1 > 28% </td><td colspan=1 rowspan=1 > 37% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 5% </td><td colspan=1 rowspan=1 > 31% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1990 </td><td colspan=1 rowspan=1 > 26% </td><td colspan=1 rowspan=1 > 33% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 6% </td><td colspan=1 rowspan=1 > 38% </td></tr>
<tr> <td colspan=1 rowspan=1 > 1995 </td><td colspan=1 rowspan=1 > 21% </td><td colspan=1 rowspan=1 > 33% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 8% </td><td colspan=1 rowspan=1 > 40% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2000 </td><td colspan=1 rowspan=1 > 21% </td><td colspan=1 rowspan=1 > 32% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 8% </td><td colspan=1 rowspan=1 > 40% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2005 </td><td colspan=1 rowspan=1 > 21% </td><td colspan=1 rowspan=1 > 30% </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 9% </td><td colspan=1 rowspan=1 > 41% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > 17.9% </td><td colspan=1 rowspan=1 > 27.3% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 4.5% </td><td colspan=1 rowspan=1 > 5.1% </td><td colspan=1 rowspan=1 > 45.3% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2011 </td><td colspan=1 rowspan=1 > 16.8% </td><td colspan=1 rowspan=1 > 26.5% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 4.7% </td><td colspan=1 rowspan=1 > 5.1% </td><td colspan=1 rowspan=1 > 46.8% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2012 </td><td colspan=1 rowspan=1 > 16.7% </td><td colspan=1 rowspan=1 > 25.8% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 4.8% </td><td colspan=1 rowspan=1 > 5.2% </td><td colspan=1 rowspan=1 > 47.4% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2013 </td><td colspan=1 rowspan=1 > 16.1% </td><td colspan=1 rowspan=1 > 26.3% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 4.8% </td><td colspan=1 rowspan=1 > 5.9% </td><td colspan=1 rowspan=1 > 46.9% </td></tr>
<tr> <td colspan=1 rowspan=1 > 2014 </td><td colspan=1 rowspan=1 > 15.8% </td><td colspan=1 rowspan=1 > 24.4% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 4.9% </td><td colspan=1 rowspan=1 > 5.6% </td><td colspan=1 rowspan=1 > 49.2% </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2015 </td><td colspan=1 rowspan=1 > 15.5% </td><td class="highlighted"  colspan=1 rowspan=1 > 23.7% </td><td colspan=1 rowspan=1 > 0.1% </td><td colspan=1 rowspan=1 > 4.9% </td><td colspan=1 rowspan=1 > 5.6% </td><td colspan=1 rowspan=1 > 50.1% </td></tr>
</table>
Question:
How much of Netherland formed Roman Catholicism in 2015 and how much was the decline from 1960s?
Answer:
Roman Catholicism of the Netherlands formed 23.7% in 2015, down from 40% in the 1960s.