Year	Percent
1990	27.23
1991	28.65
1992	28.27
1993	30.05
1994	28.63
1995	29.73
1996	28.96
1997	29.4
1998	29.57
1999	29.81
2000	28.93
2001	31.56
2002	31.53
2003	30.71
2004	28.167
2005	28.698
2006	28.377
2007	28.857
2008	27.889
2009	28.028
2010	28.476
2011	28.154
2012	27.617
2013	27.274
2014	27.311
2015	27.729
2016	28.4
2017	28.185
2018	27.97
2019	27.754
2020	27.539
2021	27.324
2022	27.109
2023	26.894
2024	26.678
2025	26.463
2026	26.248
2027	26.033
2028	25.818
2029	25.602
2030	25.387