Year	Number
1992	415.4302325581395
1993	394.7180667433832
1994	386.7647058823529
1995	372.6184834123223
1996	370.1972872996301
1997	352.61405672009863
1998	346.5688775510204
1999	328.3801020408163
2000	310.19132653061223
2001	292.37547892720306
2002	256.53008962868114
2003	283.4015345268542
2004	271.85089974293055
2005	263.5006605019815
2006	255.61736770691996
2007	231.83646112600536
2008	215.26315789473682