Year	Number of
1990	202.66
1991	205.53
1992	208.97
1993	211.99
1994	216.03
1995	219.66
1996	225.96
1997	234.39
1998	242.76
1999	252.61
2000	263.84
2001	268.05
2002	272.97
2003	277.73
2004	283.42
2005	290.55
2006	293.65
2007	296.8
2008	300.59
2009	304.76
2010	310.42
2011	318.74
2012	326.8
2013	336
2014	345.17
2015	355.78
2016	367.52