Year	%
1990	45.9789442901009
1991	44.3269908386187
1992	42.4184500311656
1993	40.2782356431727
1994	38.0653503219029
1995	35.9397710755814
1996	33.9220331682102
1997	32.0792147527127
1998	30.5033061065733
1999	29.0834504393249
2000	27.8907619512066
2001	26.9421260775728
2002	26.1430691599881
2003	25.4710865980554
2004	24.9057885281101
2005	24.4072244029922
2006	23.9792387543253
2007	23.5850534644158
2008	23.1438355514661
2009	22.6908333640485
2010	22.2825600744332
2011	21.9329119068826
2012	21.6172152488375
2013	21.3434244843753
2014	21.0990903708488
2015	20.8427372365063
2016	20.5698215068048
2017	20.2574059841161
2018	19.9534295959408
2019	19.5797238601344
2020	19.2122576177285
2021	18.8700172162627
2022	18.5534423573058