Year	Number
1992	363.7440758293839
1993	341.43449911084764
1994	325.1461988304094
1995	503.99201596806387
1996	594.3396226415094
1997	527.6923076923077
1998	503.92823418319165
1999	556.4235055724417
2000	575.4123711340206
2001	580.8350730688935
2002	580.6577595066803
2003	577.7847439916405
2004	552.001982160555
2005	513.7362637362638
2006	479.91701244813277
2007	501.3636363636364