Year	Percent
1950	30.86657
1955	30.13146
1960	32.21933
1965	30.20976
1970	28.63558
1975	28.54222
1980	27.77625
1985	27.29843
1990	28.04095
1995	27.83923
2000	28.08477
2005	29.38184
2010	27.84562
2015	25.76588
2020	23.48631
2025	22.65014
2030	21.30094
2035	21.01717
2040	20.86054
2045	20.69112
2050	20.23761
2055	20.08675
2060	20.11787
2065	20.2922
2070	20.51577
2075	20.66565
2080	20.66154
2085	20.58368
2090	20.53454
2095	20.52758
2100	20.54014