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:
Ford Mustang (fourth generation)
Table title:
Engine output summary
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Base Model </th><th colspan=1 rowspan=1 > GT </th><th colspan=1 rowspan=1 > Cobra </th><th colspan=1 rowspan=1 > Special Edition </th></tr>
<tr> <td colspan=1 rowspan=1 > 1994 </td><td colspan=1 rowspan=1 > 145 hp (108 kW) @ 4000 rpm 215 ft·lbf (291 N·m) of torque @ 2500 rpm </td><td colspan=1 rowspan=1 > 215 hp (160 kW) @ 4200 rpm 285 ft·lbf (386 N·m) of torque @ 3400 rpm </td><td colspan=1 rowspan=1 > 240 hp (179 kW) @ 4800 rpm </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1995 </td><td colspan=1 rowspan=1 > 145 hp (108 kW) @ 4000 rpm 215 ft·lbf (291 N·m) of torque @ 2500 rpm </td><td colspan=1 rowspan=1 > 215 hp (160 kW) @ 4200 rpm 285 ft·lbf (386 N·m) of torque @ 3500 rpm </td><td colspan=1 rowspan=1 > 240 hp (179 kW) </td><td colspan=1 rowspan=1 > 300 hp (Cobra R) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1996 </td><td colspan=1 rowspan=1 > 150 hp (108 kW) @ 4000 rpm 215 ft·lbf (291 N·m) of torque @ 2500 rpm </td><td colspan=1 rowspan=1 > 215 hp (160 kW) @ 4400 rpm 285 ft·lbf (386 N·m) of torque @ 3500 rpm </td><td colspan=1 rowspan=1 > 305 hp (227 kW) @ 5800 rpm 300 ft·lbf (406 N·m) of torque @ 4800 rpm </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1997 </td><td colspan=1 rowspan=1 > 150 hp (108 kW) @ 4000 rpm 215 ft·lbf (291 N·m) of torque @ 2500 rpm </td><td colspan=1 rowspan=1 > 215 hp (160 kW) @ 4400 rpm 285 ft·lbf (386 N·m) of torque @ 3500 rpm </td><td colspan=1 rowspan=1 > 305 hp (227 kW) @ 5800 rpm 300 ft·lbf (406 N·m) of torque @ 4800 rpm </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1998 </td><td colspan=1 rowspan=1 > 150 hp (108 kW) @ 4000 rpm 215 ft·lbf (291 N·m) of torque @ 2500 rpm </td><td colspan=1 rowspan=1 > 225 hp (168 kW) @ 4750 rpm 290 ft·lbf (393 N·m) of torque @ 3500 rpm </td><td colspan=1 rowspan=1 > 305 hp (227 kW) @ 5800 rpm 300 ft·lbf (406 N·m) of torque @ 4800 rpm </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1999 </td><td colspan=1 rowspan=1 > 190 hp (142 kW) @ 5250 rpm 220 ft·lbf (298 N·m) of torque @ 2750 rpm </td><td colspan=1 rowspan=1 > 260 hp (194 kW) @ 5250 rpm 302 ft·lbf (409 N·m) of torque @ 4000 rpm </td><td colspan=1 rowspan=1 > 320 hp (239 kW) @ 6000 rpm 317 ft·lbf (429 N·m) of torque @ 4750 rpm </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2000 </td><td colspan=1 rowspan=1 > 190 hp (142 kW) @ 5250 rpm 220 ft·lbf (298 N·m) of torque @ 2750 rpm </td><td colspan=1 rowspan=1 > 260 hp (194 kW) @ 5250 rpm 302 ft·lbf (409 N·m) of torque @ 4000 rpm </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 385 hp (Cobra R) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2001 </td><td colspan=1 rowspan=1 > 193 hp (144 kW) @ 5500 rpm 225 ft·lbf (305 N·m) of torque @ 2800 rpm </td><td colspan=1 rowspan=1 > 260 hp (194 kW) @ 5250 rpm 302 ft·lbf (409 N·m) of torque @ 4000 rpm </td><td colspan=1 rowspan=1 > 320 hp (239 kW) @ 6000 rpm 317 ft·lbf (429 N·m) of torque @ 4750 rpm </td><td colspan=1 rowspan=1 > 265 hp (198 kW) (Bullitt) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2002 </td><td colspan=1 rowspan=1 > 193 hp (144 kW) @ 5500 rpm 225 ft·lbf (305 N·m) of torque @ 2800 rpm </td><td colspan=1 rowspan=1 > 260 hp (194 kW) @ 5250 rpm 302 ft·lbf (409 N·m) of torque @ 4000 rpm </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2003 </td><td colspan=1 rowspan=1 > 193 hp (144 kW) @ 5500 rpm 225 ft·lbf (305 N·m) of torque @ 2800 rpm </td><td colspan=1 rowspan=1 > 260 hp (194 kW) @ 5250 rpm 302 ft·lbf (409 N·m) of torque @ 4000 rpm </td><td colspan=1 rowspan=1 > 390 hp (291 kW) † 390 ft·lbf (529 N·m) of torque </td><td class="highlighted"  colspan=1 rowspan=1 > 305 hp (227 kW) (Mach I) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2004 </td><td colspan=1 rowspan=1 > 193 hp (144 kW) @ 5500 rpm 225 ft·lbf (305 N·m) of torque @ 2800 rpm </td><td colspan=1 rowspan=1 > 260 hp (194 kW) @ 5250 rpm 302 ft·lbf (409 N·m) of torque @ 4000 rpm </td><td colspan=1 rowspan=1 > 390 hp (291 kW) † 390 ft·lbf (529 N·m) of torque </td><td colspan=1 rowspan=1 > 305 hp (227 kW) (Mach I) </td></tr>
</table>
Question:
Which engine models improved performance from 1997 to 1998?
Answer:
From 1997 to 1998, the GT model engine improved from 215 to 225 hp.