Year	Percent
1950	28.75818
1955	27.66155
1960	25.92291
1965	24.26641
1970	23.17847
1975	23.81117
1980	24.6002
1985	25.94468
1990	27.3369
1995	28.85087
2000	30.47723
2005	31.40095
2010	33.72546
2015	28.05861
2020	28.35821
2025	31.34607
2030	31.989
2035	32.89809
2040	31.87462
2045	30.32017
2050	28.74583
2055	27.62178
2060	27.04996
2065	26.38689
2070	25.51004
2075	24.45463
2080	23.40709
2085	22.60503
2090	22.07693
2095	21.71299
2100	21.35813