Year	Number
1996	34.32115
1997	33.69607
1998	33.43013
1999	33.83403
2001	35.79195
2002	38.93179
2003	44.31462
2004	44.97935
2005	48.20127
2006	32.44961
2007	30.58316
2008	31.22998
2010	34.56216
2011	37.17552
2012	41.36246
2013	32.74575
2014	26.62827
2015	33.3801
2016	30.52872
2017	34.73504