Year	Percent
1950	27.78373
1955	26.46834
1960	25.84622
1965	26.05704
1970	26.46695
1975	30.71961
1980	34.47387
1985	34.18858
1990	33.42013
1995	32.73521
2000	32.19309
2005	33.33378
2010	34.28052
2015	34.76328
2020	32.59211
2025	30.60236
2030	28.60658
2035	27.10035
2040	25.43743
2045	23.9218
2050	22.94542
2055	22.08995
2060	21.57931
2065	21.41331
2070	21.33018
2075	21.21279
2080	21.04115
2085	20.9004
2090	20.86472
2095	20.90691
2100	20.95443