Year	Percent
1950	28.19485
1955	28.18825
1960	27.6828
1965	27.62911
1970	27.98026
1975	28.54969
1980	28.85511
1985	29.07962
1990	30.58444
1995	33.81576
2000	33.42978
2005	32.46631
2010	29.73757
2015	28.91348
2020	29.00676
2025	29.1157
2030	28.27335
2035	27.0961
2040	26.35057
2045	25.92767
2050	25.69418
2055	25.1636
2060	24.57814
2065	24.00102
2070	23.48052
2075	23.05001
2080	22.72213
2085	22.44263
2090	22.16001
2095	21.8669
2100	21.57631