Year	Number
1995	30.41206
1996	30.77192
1997	29.08456
1999	28.60378
2000	22.02048
2001	20.01358
2002	20.00782
2003	25.42071
2004	26.94743
2005	25.52514
2006	25.9388
2007	19.15935
2008	19.69369
2009	19.41001
2010	19.48939
2011	18.81388
2012	18.32456
2013	17.87314
2014	19.33839
2015	22.90693
2016	23.12339
2017	16.85217
2018	16.69999