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:
1997 in baseball
Table title:
MLB statistical leaders
Table:
<table id='hittask' contenteditable='False'>
<tr> <td colspan=1 rowspan=1 >  </td><th colspan=2 rowspan=1 > American League </th><th colspan=2 rowspan=1 > National League </th></tr>
<tr> <th colspan=1 rowspan=1 > Type </th><th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Stat </th><th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Stat </th></tr>
<tr> <td colspan=1 rowspan=1 > AVG </td><td colspan=1 rowspan=1 > Frank Thomas CHW </td><td colspan=1 rowspan=1 > .347 </td><td colspan=1 rowspan=1 > Tony Gwynn SDP </td><td colspan=1 rowspan=1 > .372 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > HR </td><td class="highlighted"  colspan=1 rowspan=1 > Ken Griffey, Jr. SEA </td><td class="highlighted"  colspan=1 rowspan=1 > 56 </td><td colspan=1 rowspan=1 > Larry Walker COL </td><td colspan=1 rowspan=1 > 49 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > RBI </td><td class="highlighted"  colspan=1 rowspan=1 > Ken Griffey, Jr. SEA </td><td class="highlighted"  colspan=1 rowspan=1 > 147 </td><td colspan=1 rowspan=1 > Andrés Galarraga COL </td><td colspan=1 rowspan=1 > 140 </td></tr>
<tr> <td colspan=1 rowspan=1 > Wins </td><td colspan=1 rowspan=1 > Roger Clemens TOR </td><td colspan=1 rowspan=1 > 21 </td><td colspan=1 rowspan=1 > Denny Neagle ATL </td><td colspan=1 rowspan=1 > 20 </td></tr>
<tr> <td colspan=1 rowspan=1 > ERA </td><td colspan=1 rowspan=1 > Roger Clemens TOR </td><td colspan=1 rowspan=1 > 2.05 </td><td colspan=1 rowspan=1 > Pedro Martínez MON </td><td colspan=1 rowspan=1 > 1.90 </td></tr>
</table>
Question:
How good was Griffey's season in terms of home runs and RBI?
Answer:
Griffey led the American League with 56 home runs and 147 RBI.