Year	Percent
1950	21.70902
1955	21.47364
1960	19.38201
1965	19.67131
1970	21.32586
1975	23.70473
1980	25.46818
1985	24.24409
1990	24.15542
1995	25.08036
2000	26.50562
2005	27.68206
2010	27.54862
2015	26.38732
2020	26.68983
2025	27.25066
2030	28.28911
2035	28.51481
2040	28.02895
2045	27.68089
2050	26.47253
2055	25.55907
2060	25.09639
2065	24.70467
2070	24.62798
2075	24.50253
2080	24.23254
2085	23.90389
2090	23.65454
2095	23.5144
2100	23.42242