Year	Number of
1990	1558.07
1991	1592.95
1992	1641.6
1993	1672.87
1994	1703.51
1995	1735.79
1996	1764.99
1997	1789.54
1998	1820.86
1999	1871.84
2000	1915.28
2001	1960.72
2002	2001.09
2003	2043.7
2004	2092.88
2005	2104.56
2006	2104.18
2007	2093.77
2008	2113.9
2009	2108
2010	2146.84
2011	2179.75
2012	2236.94
2013	2250.42
2014	2275.62
2015	2289.76
2016	2310.82