Year	Number of
1990	1092.76
1991	1117.98
1992	1160.05
1993	1182.22
1994	1204.95
1995	1236.64
1996	1280.84
1997	1314.2
1998	1401.45
1999	1476.34
2000	1530.09
2001	1605.62
2002	1682.37
2003	1755.45
2004	1812.91
2005	1884.32
2006	1927.59
2007	1978.72
2008	2032.4
2009	2102.14
2010	2181.21
2011	2240.25
2012	2290.53
2013	2304.62
2014	2264.22
2015	2268.29
2016	2278.94