Year	Percent
1950	15.00996
1955	15.4923
1960	15.20954
1965	14.83481
1970	14.62247
1975	14.58804
1980	14.81903
1985	14.74085
1990	14.51363
1995	15.16653
2000	16.83675
2005	18.81115
2010	21.09506
2015	22.78167
2020	23.88989
2025	24.80062
2030	25.18951
2035	25.35177
2040	25.57897
2045	25.96222
2050	26.30605
2055	26.88797
2060	27.1682
2065	27.04347
2070	26.91825
2075	26.53889
2080	26.33455
2085	26.21768
2090	26.09055
2095	25.87516
2100	25.58724