Year	Percent
1950	10.72286
1955	10.65805
1960	9.50896
1965	8.50952
1970	7.52904
1975	7.67069
1980	7.46884
1985	7.26945
1990	6.50532
1995	5.59455
2000	5.84136
2005	5.02523
2010	5.3945
2015	5.16195
2020	4.82278
2025	4.59093
2030	4.48261
2035	4.44087
2040	4.48781
2045	4.54928
2050	4.51571
2055	4.41814
2060	4.36043
2065	4.37371
2070	4.43893
2075	4.51862
2080	4.56541
2085	4.55741
2090	4.52939
2095	4.5237
2100	4.55118