Year	Percent
1950	28.43468
1955	26.46273
1960	25.42342
1965	24.23178
1970	24.74875
1975	25.29328
1980	26.57645
1985	28.4909
1990	28.89023
1995	28.86824
2000	28.07457
2005	26.87173
2010	26.26416
2015	25.85239
2020	25.17993
2025	23.91277
2030	23.1934
2035	22.9944
2040	23.19295
2045	23.5563
2050	23.25408
2055	22.76573
2060	22.39266
2065	22.23039
2070	22.25606
2075	22.29266
2080	22.1676
2085	21.87486
2090	21.54435
2095	21.28763
2100	21.12863