Year	Number
1996	39.8936157226563
1998	57.4468078613281
2000	42.3280410766602
2002	37.037036895752
2003	32.1608047485352
2004	35.4368934631348
2005	29.1262130737305
2006	30.917875289917
2007	27.5362319946289
2008	25.9615383148193
2009	31.2796211242676
2010	32.7014236450195
2011	33.6492881774902
2012	32.7014236450195
2013	28.9099521636963
2014	29.5238094329834
2015	33.8095245361328
2016	34.2857131958008
2017	30.9523811340332
2018	33.9622650146484
2019	32.5471687316895
2020	33.9622650146484
2021	31.6037731170654
2022	34.4339637756348