| Year | Item | P |
| 2001 | a | 100 |
| 2002 | a | 130 |
| 2003 | a | 150 |
| 2004 | a | 170 |
| 2001 | b | 210 |
| 2002 | b | 220 |
| 2003 | b | 230 |
| 2004 | b | 210 |
| 2001 | c | 150 |
| 2002 | c | 200 |
| 2003 | c | 203 |
| 2004 | c | 300 |
如何新增一列
| Year | Item | P | growth |
| 2001 | a | 100 | |
| 2002 | a | 130 | 0.3 |
| 2003 | a | 150 | 0.153846 |
| 2004 | a | 170 | 0.133333 |
| 2001 | b | 210 | |
| 2002 | b | 220 | 0.047619 |
| 2003 | b | 230 | 0.045455 |
| 2004 | b | 210 | -0.08696 |
| 2001 | c | 150 | |
| 2002 | c | 200 | 0.333333 |
| 2003 | c | 203 | 0.015 |
| 2004 | c | 300 | 0.477833 |



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