Year	Number
1993	46.70382
1994	42.73302
1995	43.17817
1996	40.16961
1999	38.14266
2000	37.07681
2001	37.73186
2002	39.67494
2003	40.38001
2004	40.47697
2007	47.61001
2008	51.73333
2010	39.85251
2011	36.92924
2012	37.10858
2013	36.18234
2014	35.3968
2015	35.05985
2016	34.95006
2017	34.03857
2019	31.99445