Year	Percent
1950	23.75476
1955	22.3345
1960	22.9923
1965	21.49091
1970	21.31739
1975	22.66355
1980	24.42309
1985	27.94416
1990	29.79062
1995	31.43027
2000	31.71856
2005	31.6727
2010	31.69352
2015	31.56876
2020	31.15676
2025	29.9195
2030	28.97004
2035	27.71935
2040	26.56863
2045	25.63677
2050	24.33902
2055	23.19791
2060	22.17672
2065	21.39345
2070	20.80342
2075	20.33434
2080	19.87037
2085	19.44971
2090	19.10963
2095	18.86443
2100	18.70913