Year	Number of
1990	720.42
1991	772.79
1992	841.01
1993	916.41
1994	994.97
1995	1066.94
1996	1147.59
1997	1251.79
1998	1360.24
1999	1481.86
2000	1594.76
2001	1706.21
2002	1815.16
2003	1918.69
2004	1989.56
2005	2120.68
2006	2293.45
2007	2441.26
2008	2590.58
2009	2782.36
2010	2961.47
2011	3067.86
2012	3141.94
2013	3131.39
2014	3155.91
2015	3181.64
2016	3221.77