Year	Number
1995	10.70641
1996	9.91409
1997	10.63751
1999	14.54841
2000	14.38273
2001	14.14763
2002	14.68525
2003	15.78745
2004	15.96554
2005	16.69655
2006	17.54547
2007	17.32194
2008	19.04775
2009	17.55612
2010	16.82844
2011	16.26583
2012	16.53644
2013	16.67084
2014	16.57524
2015	16.50996
2016	15.7664
2017	14.94813
2018	13.84031