Year	Number of
1990	1095.83
1991	1099.12
1992	1108.47
1993	1127.68
1994	1166.66
1995	1223.23
1996	1255.22
1997	1277.1
1998	1294.07
1999	1316.77
2000	1329.58
2001	1335.96
2002	1343.04
2003	1343.97
2004	1332.21
2005	1309.97
2006	1287.07
2007	1263.49
2008	1253.71
2009	1247.1
2010	1242.82
2011	1223.83
2012	1222.49
2013	1236.92
2014	1265.29
2015	1298.69
2016	1333.35