Year	Number
1996	23
1998	21.3930339813232
2000	24.8756217956543
2002	26.3681583404541
2003	25.3731346130371
2004	29.8076915740967
2005	32.6923065185547
2006	26.9230766296387
2007	25
2008	25.480770111084
2009	24.1706161499023
2010	25.5924167633057
2011	25.8215961456299
2012	26.7605628967285
2013	26.7605628967285
2014	29.0640392303467
2015	28.0788173675537
2016	28.0788173675537
2017	27.5862064361572
2018	25.2427177429199
2019	23.1884059906006
2020	23.1884059906006
2021	25.6038646697998
2022	25.6038646697998