Year	Percent
1950	24.05475
1955	24.8706
1960	24.99969
1965	24.69766
1970	23.48484
1975	22.29778
1980	22.11435
1985	23.5995
1990	26.02057
1995	27.50677
2000	28.42988
2005	28.78137
2010	28.08804
2015	27.62955
2020	26.92542
2025	25.00592
2030	23.51752
2035	24.00501
2040	24.5343
2045	25.27623
2050	25.43109
2055	24.13538
2060	23.3053
2065	23.20791
2070	23.15847
2075	23.63717
2080	23.8109
2085	23.5707
2090	23.16679
2095	22.88668
2100	22.81387