Year	Percent
1950	29.62218
1955	28.11959
1960	26.93791
1965	25.92711
1970	27.39754
1975	28.84405
1980	30.69103
1985	32.37068
1990	32.04101
1995	31.02395
2000	28.99147
2005	26.64997
2010	24.69495
2015	24.04578
2020	23.93725
2025	23.8574
2030	23.09174
2035	22.17019
2040	21.69668
2045	21.37586
2050	21.50217
2055	21.77664
2060	21.8021
2065	21.56405
2070	21.24634
2075	21.02988
2080	20.97233
2085	21.01236
2090	20.99885
2095	20.84547
2100	20.61704