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:
BMW M30
Table title:
Versions
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Version </th><th colspan=1 rowspan=1 > Displacement </th><th colspan=1 rowspan=1 > Power output </th><th colspan=1 rowspan=1 > Torque </th><th colspan=1 rowspan=1 > Year </th></tr>
<tr> <td colspan=1 rowspan=1 > M30B25V </td><td colspan=1 rowspan=2 > 2,494 cc (152.2 cu in) </td><td class="highlighted"  colspan=1 rowspan=2 > 110 kW (148 bhp) at 6,000 rpm </td><td class="highlighted"  colspan=1 rowspan=1 > 211 N⋅m (156 lb⋅ft) at 3,700 rpm </td><td colspan=1 rowspan=1 > 1968 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B25 </td><td class="highlighted"  colspan=1 rowspan=1 > 215 N⋅m (159 lb⋅ft) at 3,700 rpm </td><td colspan=1 rowspan=1 > 1981 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B28V </td><td colspan=1 rowspan=2 > 2,788 cc (170.1 cu in) </td><td colspan=1 rowspan=1 > 125 kW (168 bhp) at 6,000 rpm </td><td colspan=1 rowspan=1 > 235 N⋅m (173 lb⋅ft) at 3,700 </td><td colspan=1 rowspan=1 > 1968 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B28 </td><td colspan=1 rowspan=1 > 135 kW (181 bhp) at 5,800 rpm </td><td colspan=1 rowspan=1 > 240 N⋅m (177 lb⋅ft) at 4,200 rpm </td><td colspan=1 rowspan=1 > 1977 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B30V </td><td colspan=1 rowspan=2 > 2,986 cc (182.2 cu in) </td><td colspan=1 rowspan=1 > 132 kW (177 bhp) at 6,000 rpm </td><td colspan=1 rowspan=1 > 255 N⋅m (188 lb⋅ft) at 3,700 rpm </td><td colspan=1 rowspan=1 > 1971 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B30 </td><td colspan=1 rowspan=1 > 149 kW (200 bhp) at 5,500 rpm </td><td colspan=1 rowspan=1 > 272 N⋅m (201 lb⋅ft) at 4,300 rpm </td><td colspan=1 rowspan=1 > 1971 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B32 </td><td colspan=1 rowspan=1 > 3,210 cc (195.9 cu in) </td><td colspan=1 rowspan=1 > 147 kW (197 bhp) at 5,500 rpm </td><td colspan=1 rowspan=1 > 285 N⋅m (210 lb⋅ft) at 4,300 rpm </td><td colspan=1 rowspan=1 > 1976 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B33V </td><td colspan=1 rowspan=1 > 3,295 cc (201.1 cu in) </td><td colspan=1 rowspan=1 > 139 kW (186 bhp) at 5,500 rpm </td><td colspan=1 rowspan=1 > 289 N⋅m (213 lb⋅ft) at 3,500 rpm </td><td colspan=1 rowspan=1 > 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B34 </td><td colspan=1 rowspan=2 > 3,430 cc (209.3 cu in) </td><td colspan=1 rowspan=1 > 160 kW (215 bhp) at 5,800 rpm </td><td colspan=1 rowspan=1 > 310 N⋅m (229 lb⋅ft) at 4,200 rpm </td><td colspan=1 rowspan=1 > 1982 </td></tr>
<tr> <td colspan=1 rowspan=1 > M30B35 </td><td colspan=1 rowspan=1 > 155 kW (208 bhp) at 5,700 rpm </td><td colspan=1 rowspan=1 > 305 N⋅m (225 lb⋅ft) at 4,000 rpm </td><td colspan=1 rowspan=1 > 1988 </td></tr>
</table>
Question:
What changed in power and torque between 1968-1981 for the M30B25?
Answer:
Power remained unchanged at 110 kW (148 bhp), however torque increased slightly to 215 N⋅m (159 lb⋅ft).