Year	Percent
1990	23.198
1991	23.221
1992	23.299
1993	23.426
1994	24.352
1995	22.857
1996	22.044
1997	21.247
1998	20.47
1999	21.54
2000	21.595
2001	21.778
2002	20.481
2003	20.929
2004	21.422
2005	21.963
2006	22.554
2007	24.466
2008	24.54
2009	24.631
2010	24.491
2011	23.673
2012	23.881
2013	24.684
2014	24.403
2015	24.111
2016	23.944
2017	24.102
2018	24.246
2019	24.397
2020	24.562
2021	24.749
2022	24.952
2023	25.157
2024	25.342
2025	25.498
2026	25.635
2027	25.742
2028	25.845
2029	25.979
2030	26.165