Year	Number of
1990	296.41
1991	305.72
1992	331.51
1993	358.89
1994	388.18
1995	421.89
1996	430.67
1997	444.42
1998	457.27
1999	475.87
2000	495.55
2001	506.58
2002	526.26
2003	551.53
2004	579.59
2005	615.68
2006	633.61
2007	657.86
2008	684.91
2009	714.46
2010	744.51
2011	772.11
2012	801.7
2013	831.5
2014	859.57
2015	895.08
2016	931.09