Year	Number
1995	12.02628
1998	12.67088
1999	12.98911
2000	13.11259
2001	13.0122
2002	13.13552
2003	13.13813
2004	13.20882
2005	11.89517
2006	11.39496
2007	12.16664
2008	11.23606
2009	12.00535
2010	11.27575
2011	15.51582
2012	17.41974
2013	16.85029
2014	16.57657
2016	14.41713
2017	15.49818
2018	14.95484