Year	Number
1996	37.5
1998	45.7711448669434
2000	38.8059692382813
2002	43.7810935974121
2003	46.766170501709
2004	44.711540222168
2005	46.1538467407227
2006	52.4038467407227
2007	55.769229888916
2008	54.3269233703613
2009	54.9763031005859
2010	53.0805702209473
2011	47.417839050293
2012	48.8262901306152
2013	46.948356628418
2014	43.8423652648926
2015	40.8866996765137
2016	38.9162559509277
2017	41.8719215393066
2018	44.6601943969727
2019	44.4444427490234
2020	49.7584533691406
2021	52.1739120483398
2022	53.6231880187988