Year	Number
1996	68.6170196533203
1998	44.1489372253418
2000	31.7460308074951
2002	19.0476188659668
2003	10.5527639389038
2004	5.33980560302734
2005	6.31067943572998
2006	11.5942029953003
2007	9.17874431610107
2008	10.5769233703613
2009	13.2701425552368
2010	12.3222751617432
2011	16.5876770019531
2012	17.5355453491211
2013	21.8009471893311
2014	30
2015	22.8571434020996
2016	27.1428565979004
2017	38.0952377319336
2018	39.1509437561035
2019	43.8679237365723
2020	52.8301887512207
2021	51.4150924682617
2022	51.4150924682617