Year	Number of
1990	166.38
1991	176.4
1992	186.91
1993	198.46
1994	210.86
1995	224.32
1996	246.73
1997	271.74
1998	300.46
1999	332.04
2000	366.79
2001	396.56
2002	428.88
2003	465.41
2004	504.86
2005	547.66
2006	572.63
2007	598.81
2008	627.66
2009	657.93
2010	689.81
2011	711.61
2012	734.41
2013	758.28
2014	783.89
2015	811.49
2016	838.9