求教：怎么样在stata中实现用流量计算存量？下面lnfdi是流量，怎么样计算出每年的存量呢？
id
| year
| lnfdi
|
| 1 | 1980 | 0 |
| 1 | 1981 | 0 |
| 1 | 1982 | 0 |
| 1 | 1983 | 0 |
| 1 | 1984 | 0 |
| 1 | 1985 | 0 |
| 1 | 1986 | 0 |
| 1 | 1987 | 0 |
| 1 | 1988 | 0 |
| 1 | 1989 | 8.728224 |
| 1 | 1990 | 9.201027 |
| 1 | 1991 | 9.590228 |
| 1 | 1992 | 9.93522 |
| 1 | 1993 | 9.883141 |
| 1 | 1994 | 8.47658 |
| 1 | 1995 | 4.543295 |
| 1 | 1996 | 0 |
| 1 | 1997 | 10.21468 |
| 1 | 1998 | 8.895493 |
| 1 | 1999 | 0 |
| 1 | 2000 | 11.35603 |
| 1 | 2001 | 0 |
| 1 | 2002 | 0 |
| 1 | 2003 | 0 |
| 1 | 2004 | 0 |
| 1 | 2005 | 5.952204 |
| 1 | 2006 | 6.44101 |
| 1 | 2007 | 5.525453 |
| 1 | 2008 | 7.971171 |
| 1 | 2009 | 7.492485 |
| 1 | 2010 | 5.112247 |
| 1 | 2011 | 2.684372 |
| 1 | 2012 | 4.037457 |
| 1 | 2013 | 6.25575 |
| 1 | 2014 | 6.080716 |
| 2 | 1980 | 0 |
| 2 | 1981 | 2.335439 |
| 2 | 1982 | 0 |
| 2 | 1983 | 0 |
| 2 | 1984 | 4.59512 |
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