Year	Number
1996	35.1758804321289
1998	35.5
2000	37.3134346008301
2002	38.8059692382813
2003	39.8009948730469
2004	42.3076934814453
2005	41.1483268737793
2006	42.1052627563477
2007	40.6698570251465
2008	37.5
2009	44.5497627258301
2010	44.0758285522461
2011	48.8262901306152
2012	40.3755874633789
2013	39.9061050415039
2014	42.788459777832
2015	40.9523811340332
2016	45.238094329834
2017	44.761905670166
2018	37.1428565979004
2019	36.6666679382324
2020	31.9047622680664
2021	31.9047622680664
2022	25.4716987609863