Year	Percent
1950	29.01064
1955	28.81156
1960	28.59139
1965	29.04468
1970	29.58768
1975	30.81417
1980	31.06981
1985	33.59322
1990	34.26462
1995	32.81435
2000	30.58632
2005	29.13424
2010	27.61837
2015	26.91441
2020	26.13291
2025	24.86763
2030	23.95651
2035	23.20003
2040	22.62022
2045	22.55454
2050	22.39682
2055	22.3361
2060	22.28447
2065	22.17335
2070	22.01824
2075	21.85969
2080	21.73717
2085	21.63942
2090	21.52109
2095	21.37151
2100	21.19211