Year	%
1990	18.1818181818182
1991	20
1992	21.0526315789474
1993	24
1994	21.875
1995	24.390243902439
1996	25
1997	24.2424242424242
1998	25.3012048192771
1999	25
2000	25.5813953488372
2001	25.7861635220126
2002	25.6410256410256
2003	26.271186440678
2004	26.3698630136986
2005	26.685393258427
2006	27.2300469483568
2007	27.2908366533864
2008	27.4914089347079
2009	27.5187969924812
2010	27.5769745649264
2011	27.6029055690073
2012	27.5862068965517
2013	27.6464542651593
2014	27.7511961722488
2015	27.7628032345014
2016	27.9050042408821
2017	27.8807413376309
2018	27.9320987654321
2019	28.1133482475764
2020	28.3333333333333
2021	28.5613540197461
2022	28.7972508591065