Year	Percent
1950	28.23349
1955	26.96012
1960	26.06372
1965	25.34168
1970	24.51857
1975	21.6521
1980	25.31522
1985	26.7535
1990	28.36782
1995	26.83253
2000	27.75895
2005	27.62533
2010	28.62492
2015	32.258
2020	35.58929
2025	35.71511
2030	34.39751
2035	32.29012
2040	30.66814
2045	30.13213
2050	30.33941
2055	30.31815
2060	29.3551
2065	27.85844
2070	26.53822
2075	25.92302
2080	25.98311
2085	26.13941
2090	25.81577
2095	24.94095
2100	23.94399