Year	%
1990	23.4567901234568
1991	23.5294117647059
1992	23.6220472440945
1993	23.0769230769231
1994	22.5130890052356
1995	22.0779220779221
1996	21.6606498194946
1997	21.301775147929
1998	20.873786407767
1999	20.4819277108434
2000	20
2001	19.5467422096317
2002	19.2028985507246
2003	18.6652763295099
2004	18.1569343065693
2005	17.6755447941889
2006	17.2883787661406
2007	16.9871794871795
2008	16.5991902834008
2009	16.2262156448203
2010	15.87147030185
2011	15.5785682125169
2012	15.2620545073375
2013	14.9842271293375
2014	14.5941921072226
2015	14.2101551480959
2016	13.8368983957219
2017	13.5512535702951
2018	13.2668479903294
2019	13.0233901241698
2020	12.8531855955679
2021	12.6899493468408
2022	12.5160297512183