Year	Percent
1950	30.82039
1955	28.33742
1960	26.73399
1965	25.69686
1970	27.07242
1975	28.8602
1980	30.89011
1985	32.29136
1990	31.99368
1995	31.26366
2000	29.45683
2005	28.0919
2010	28.40824
2015	28.01108
2020	27.33718
2025	25.94941
2030	25.06347
2035	24.74318
2040	25.01823
2045	25.23513
2050	24.91901
2055	24.38776
2060	23.77015
2065	23.38107
2070	23.19901
2075	23.09045
2080	22.89887
2085	22.57007
2090	22.15837
2095	21.77628
2100	21.47764