Year	Number
1996	34.042552947998
1998	25
2000	25.9259262084961
2002	37.5661392211914
2003	51.7587928771973
2004	40.7766990661621
2005	42.7184448242188
2006	38.164249420166
2007	47.8260879516602
2008	44.230770111084
2009	52.6066360473633
2010	49.7630348205566
2011	44.0758285522461
2012	51.1848335266113
2013	50.2369651794434
2014	35.7142868041992
2015	37.1428565979004
2016	22.380952835083
2017	25.238094329834
2018	29.7169818878174
2019	30.1886787414551
2020	20.2830181121826
2021	18.8679237365723
2022	17.9245281219482