Year	Percent
1950	3.7445
1955	3.39394
1960	3.0437
1965	2.75189
1970	2.78081
1975	3.02881
1980	3.29857
1985	3.53977
1990	3.77643
1995	4.25749
2000	5.20685
2005	6.01987
2010	6.22964
2015	6.63197
2020	8.04386
2025	9.96693
2030	12.22382
2035	14.67342
2040	17.53356
2045	21.96695
2050	26.96881
2055	30.73294
2060	32.59317
2065	33.45678
2070	34.62535
2075	36.51668
2080	38.17349
2085	39.05388
2090	39.20057
2095	39.15992
2100	39.42186