Year	%
1990	19.6428571428571
1991	19.2307692307692
1992	19.4444444444444
1993	19.8653198653199
1994	20
1995	20.353982300885
1996	20.8421052631579
1997	21.243115656963
1998	21.7980295566502
1999	22.3618090452261
2000	22.9620145113103
2001	23.6147266641874
2002	24.2866622428666
2003	24.9697336561743
2004	25.6619718309859
2005	26.378896882494
2006	27.1424916858532
2007	27.8925105747698
2008	28.6203522504892
2009	29.3061620572538
2010	29.9370764762827
2011	30.4463852498787
2012	30.7053941908714
2013	30.7409224730128
2014	30.6860093434964
2015	30.615763546798
2016	30.5774925962488
2017	30.5101535413571
2018	30.3677932405567
2019	30.1168863466799
2020	29.7619047619048
2021	29.397233201581
2022	29.0132547864507