Year	Percent
1950	17.88678
1955	17.28859
1960	16.32435
1965	16.59636
1970	17.77011
1975	19.24871
1980	21.65478
1985	22.19757
1990	22.19509
1995	23.38424
2000	25.06127
2005	26.4274
2010	26.97965
2015	26.45093
2020	26.22989
2025	26.34914
2030	26.69354
2035	26.59255
2040	26.19849
2045	25.21305
2050	24.94125
2055	24.43045
2060	23.91335
2065	23.60931
2070	23.09044
2075	22.73016
2080	22.55665
2085	22.45776
2090	22.36242
2095	22.23632
2100	22.05464