Year	Percent
1950	16.95691
1955	17.72665
1960	17.90991
1965	17.05532
1970	15.34948
1975	14.48243
1980	15.96614
1985	17.30276
1990	19.25323
1995	22.69185
2000	26.61669
2005	28.60395
2010	30.04089
2015	28.7481
2020	26.01309
2025	23.34903
2030	22.11257
2035	22.53518
2040	24.36485
2045	25.78565
2050	26.36228
2055	26.23702
2060	25.90972
2065	25.5884
2070	25.54741
2075	25.1365
2080	24.58509
2085	24.14998
2090	23.88929
2095	23.74649
2100	23.63186