Year	Percent
1950	17.1678
1955	16.32871
1960	15.14322
1965	15.15191
1970	16.48829
1975	18.27277
1980	20.877
1985	21.51312
1990	21.62855
1995	23.13761
2000	25.08377
2005	26.71304
2010	27.31925
2015	26.48501
2020	26.12771
2025	26.27776
2030	26.80606
2035	27.09846
2040	26.95896
2045	26.11948
2050	25.90887
2055	25.33547
2060	24.73629
2065	24.27691
2070	23.59214
2075	23.13325
2080	22.90969
2085	22.8053
2090	22.71033
2095	22.59157
2100	22.41895