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:
Catholic Church in the Netherlands
Table title:

Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > year </th><th colspan=1 rowspan=1 > population </th><th colspan=1 rowspan=1 > Catholics (based on registration by the church itself) </th><th colspan=1 rowspan=1 > Percentage (based on registration by the church itself) </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1970 </td><td colspan=1 rowspan=1 > 12,957,621 </td><td colspan=1 rowspan=1 > 5,320,000 </td><td class="highlighted"  colspan=1 rowspan=1 > 40.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1980 </td><td colspan=1 rowspan=1 > 14,091,014 </td><td colspan=1 rowspan=1 > 5,620,000 </td><td colspan=1 rowspan=1 > 39.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1990 </td><td colspan=1 rowspan=1 > 14,892,574 </td><td colspan=1 rowspan=1 > 5,560,000 </td><td colspan=1 rowspan=1 > 37.0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1995 </td><td colspan=1 rowspan=1 > 15,424,122 </td><td colspan=1 rowspan=1 > 5,385,258 </td><td colspan=1 rowspan=1 > 34.8 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2000 </td><td colspan=1 rowspan=1 > 15,863,950 </td><td colspan=1 rowspan=1 > 5,060,413 </td><td colspan=1 rowspan=1 > 31.6 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2005 </td><td colspan=1 rowspan=1 > 16,305,526 </td><td colspan=1 rowspan=1 > 4,406,000 </td><td colspan=1 rowspan=1 > 27.0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > 16,574,989 </td><td colspan=1 rowspan=1 > 4,166,000 </td><td colspan=1 rowspan=1 > 25.0 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2015 </td><td colspan=1 rowspan=1 > 16,900,726 </td><td class="highlighted"  colspan=1 rowspan=1 > 3,882,000 </td><td class="highlighted"  colspan=1 rowspan=1 > 22.9 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2016 </td><td colspan=1 rowspan=1 > 16,979,120 </td><td colspan=1 rowspan=1 > 3,832,000 </td><td colspan=1 rowspan=1 > 22.4 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2017 </td><td colspan=1 rowspan=1 > 17,081,057 </td><td colspan=1 rowspan=1 > 3,769,000 </td><td colspan=1 rowspan=1 > 21.9 </td></tr>
</table>
Question:
What was the change in the Catholic population of the Netherlands from 1970 to 2015?
Answer:
In 2015, there are 3.882 million Catholics registered (based on Catholic Church registration) in the Netherlands, representing 22.9% of the population, which is down from more than 40% in 1970.