Year	Number of
1990	88.59
1991	92.17
1992	94.51
1993	95.56
1994	98.5
1995	104.39
1996	108.12
1997	114.78
1998	121.94
1999	122.48
2000	120.95
2001	111.63
2002	105.29
2003	98
2004	93.67
2005	91.78
2006	97.22
2007	103.18
2008	108.29
2009	112.86
2010	117.02
2011	120.34
2012	124.01
2013	129.17
2014	135.29
2015	143.09
2016	152.05