Year	Percent
1950	28.56932
1955	28.84271
1960	28.71955
1965	28.2551
1970	26.81511
1975	26.38931
1980	25.97811
1985	25.97677
1990	26.2577
1995	26.94501
2000	27.77852
2005	27.71
2010	27.95322
2015	28.61671
2020	29.31102
2025	29.84228
2030	30.19625
2035	30.47549
2040	30.62814
2045	30.82261
2050	30.99574
2055	31.03588
2060	30.97537
2065	30.87314
2070	30.75701
2075	30.59669
2080	30.40398
2085	30.17862
2090	29.92464
2095	29.64874
2100	29.34779