Year	Number of
1990	177478.08
1991	179883.54
1992	185426.32
1993	192581.6
1994	201388.3
1995	207853.66
1996	217711.7
1997	228192.9
1998	238623.77
1999	250831.42
2000	264358.73
2001	280160.15
2002	297624.46
2003	308970.43
2004	326206.76
2005	347935.31
2006	355573.95
2007	369015.98
2008	385809.95
2009	407214.31
2010	430927.02
2011	442452.68
2012	456807.89
2013	474234.54
2014	495349.78
2015	508383.73
2016	518996.1