Year	Number of
1990	204.69
1991	204.88
1992	205.26
1993	203.08
1994	201.61
1995	200.77
1996	193.78
1997	189.01
1998	187.2
1999	182.73
2000	182.36
2001	184.56
2002	190.57
2003	198.48
2004	203.93
2005	208.65
2006	212.36
2007	214.73
2008	215.32
2009	214.75
2010	215.5
2011	216.44
2012	216.64
2013	218.63
2014	223.7
2015	219.56
2016	214.56