Year	Number
1994	13.44659
1995	13.36533
1996	13.60308
1997	14.16388
1998	15.51577
1999	14.02143
2000	14.66081
2001	16.40204
2002	16.71901
2003	15.39244
2004	15.69121
2005	15.91329
2006	16.27857
2007	15.41647
2008	15.31323
2009	15.26084
2010	15.30534
2011	15.23899
2012	14.88819
2013	16.32023
2014	15.84546
2015	15.23637
2016	14.86597
2017	14.52395
2018	14.328