Year	Percent
1950	16.32744
1955	20.32035
1960	20.54748
1965	18.96855
1970	18.5136
1975	18.85205
1980	18.67252
1985	18.17931
1990	16.74912
1995	14.9286
2000	13.25103
2005	11.84449
2010	10.98507
2015	9.95634
2020	9.03421
2025	8.15432
2030	7.42317
2035	6.82126
2040	6.34621
2045	5.94425
2050	5.59319
2055	5.29316
2060	5.03047
2065	4.83026
2070	4.67596
2075	4.55882
2080	4.47859
2085	4.41344
2090	4.36444
2095	4.32869
2100	4.30869