Year	Number
1996	6.5
1998	10.4477615356445
2000	20.3980102539063
2002	41.7910461425781
2003	38.3084564208984
2004	35.5769233703613
2005	33.6538467407227
2006	46.1538467407227
2007	50
2008	49.519229888916
2009	52.6066360473633
2010	51.1848335266113
2011	52.1126747131348
2012	49.7652587890625
2013	52.582160949707
2014	48.7684745788574
2015	47.7832527160645
2016	47.290641784668
2017	42.8571434020996
2018	37.3786392211914
2019	37.1980667114258
2020	35.7487907409668
2021	35.7487907409668
2022	37.6811599731445