Year	Percent
1950	30.33202
1955	27.33183
1960	24.45389
1965	23.18251
1970	24.27989
1975	25.89449
1980	27.90114
1985	29.01514
1990	29.1487
1995	29.04708
2000	27.84505
2005	26.60347
2010	25.96135
2015	26.28609
2020	26.39234
2025	26.01423
2030	25.37706
2035	24.60545
2040	24.16998
2045	24.03282
2050	23.84653
2055	23.80142
2060	23.56057
2065	23.22153
2070	22.89883
2075	22.65053
2080	22.47205
2085	22.31193
2090	22.10951
2095	21.85132
2100	21.58081