Year	%
1990	19.2307692307692
1991	21.875
1992	20.5128205128205
1993	21.2765957446809
1994	19.2982456140351
1995	19.1176470588235
1996	19.7530864197531
1997	18.9473684210526
1998	18.9189189189189
1999	18.6046511627907
2000	18.2432432432432
2001	17.9640718562874
2002	17.741935483871
2003	17.0731707317073
2004	17.1806167400881
2005	16.7330677290837
2006	16.6666666666667
2007	16.2251655629139
2008	16.1094224924012
2009	15.5988857938719
2010	15.4822335025381
2011	15.1724137931035
2012	14.8148148148148
2013	14.4424131627057
2014	14.0776699029126
2015	13.6103151862464
2016	13.265306122449
2017	12.9142857142857
2018	12.5773195876289
2019	12.2774133083411
2020	11.931330472103
2021	11.5781126090404
2022	14.4363876071193