Year	Percent
1950	28.96179
1955	28.55008
1960	27.92445
1965	27.12401
1970	26.33418
1975	26.00137
1980	25.70569
1985	26.18601
1990	27.09374
1995	28.46961
2000	29.82698
2005	30.40449
2010	30.3463
2015	28.47967
2020	27.61076
2025	27.79046
2030	28.94753
2035	30.16873
2040	30.58467
2045	30.5776
2050	30.34877
2055	30.21692
2060	30.32929
2065	30.32481
2070	30.08805
2075	29.6917
2080	29.28283
2085	28.96148
2090	28.6687
2095	28.3397
2100	27.95584