Year	Percent
1950	3.72932
1955	3.49019
1960	3.63295
1965	4.18065
1970	4.41713
1975	5.50392
1980	5.80996
1985	5.96464
1990	9.24933
1995	8.34032
2000	7.705
2005	8.66466
2010	8.19759
2015	9.42428
2020	11.40361
2025	13.89786
2030	17.56352
2035	19.54951
2040	20.18127
2045	21.25306
2050	22.15507
2055	23.40572
2060	25.15481
2065	26.72895
2070	28.10375
2075	29.35994
2080	30.54383
2085	31.61832
2090	32.51712
2095	33.20524
2100	33.69174