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| YEAR | INDEP | % CHANGE | PUPS | % CHANGE | PUP/INDEP RATIO | TOTAL | % CHANGE |
| 1983 | 1156 | - | 121 | - | 10.5 : 100 | 1277 | - |
| 1984 | 1180 | 2.1 | 123 | 1.6 | 10.4 : 100 | 1303 | 2.0 |
| 1985 | 1119 | -5.2 | 242 | 96.8 | 21.6 : 100 | 1361 | 4.5 |
| 1986 | 1358 | 21.4 | 228 | -5.8 | 16.8 : 100 | 1586 | 14.2 |
| 1987 | 1435 | 5.7 | 226 | -0.9 | 15.7 : 100 | 1661 | 4.7 |
| 1988 | 1504 | 4.8 | 221 | -2.2 | 14.7 : 100 | 1725 | 3.9 |
| 1989 | 1571 | 4.4 | 285 | 29.0 | 18.1 : 100 | 1856 | 7.6 |
| 1990 | 1466 | -6.7 | 214 | -24.9 | 14.6 : 100 | 1680 | -9.5 |
| 1991 | 1700 | 16.0 | 241 | 12.6 | 14.2 : 100 | 1941 | 15.5 |
| 1992 | 1810 | 6.5 | 291 | 20.8 | 16.1 : 100 | 2101 | 8.2 |
| 1993 | 2022 | 11.7 | 217 | -25.4 | 10.7 : 100 | 2239 | 6.6 |
| 1994 | 2076 | 2.7 | 283 | 30.4 | 13.6 : 100 | 2359 | 5.4 |
| 1995 | 2095 | 0.9 | 282 | -0.4 | 13.5 : 100 | 2377 | 0.8 |
| 1996 | 1963 | -6.3 | 315 | 11.7 | 16.0 : 100 | 2278 | -4.2 |
| 1997 | 1919 | -2.2 | 310 | -1.6 | 16.2 : 100 | 2229 | -2.2 |
| 1998 | 1955 | 1.9 | 159 | -48.7 | 8.1 : 100 | 2114 | -5.2 |
| 1999 | 1858 | -5.0 | 232 | 45.9 | 12.5 : 100 | 2090 | -1.1 |
| 2000 | 2053 | 10.5 | 264 | 13.8 | 12.9:100 | 2317 | 10.9 |
| 2001 | 1863 | -9.3 | 298 | 12.9 | 16.0:100 | 2161 | -6.7 |
| 2002 | 1846 | -0.9 | 293 | -1.7 | 15.9:100 | 2139 | -1.0 |
| 2003 | 2270 | 23.0 | 235 | -19.8 | 10.4:100 | 2505 | 17.1 |
| 2004 | 2495 | 9.9 | 330 | 40.4 | 13.2:100 | 2825 | 12.8 |
| 2005 | 2417 | -3.1 | 318 | -3.6 | 13.2:100 | 2735 | -3.2 |
| 2006 | 2369 | -2.0 | 323 | 1.6 | 13.6:100 | 2692 | -1.6 |
| 2007 | 2637 | 11.3 | 389 | 20.4 | 14.8:100 | 3026 | 12.4 |
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