Year	Percent
1950	6.67052
1955	6.1457
1960	5.26043
1965	4.47522
1970	3.95194
1975	3.54369
1980	3.40862
1985	3.51046
1990	3.78705
1995	3.81754
2000	4.02047
2005	4.26372
2010	4.50815
2015	4.79689
2020	5.17068
2025	5.91321
2030	6.7854
2035	7.70605
2040	8.76583
2045	9.89237
2050	11.30511
2055	13.12144
2060	14.81284
2065	16.21106
2070	17.67823
2075	19.27425
2080	20.92794
2085	22.53011
2090	24.03541
2095	25.46906
2100	26.86835