Year	Percent
1950	4.50999
1955	4.41521
1960	3.8671
1965	3.62277
1970	3.46394
1975	3.6967
1980	3.97502
1985	4.14719
1990	4.66836
1995	5.78052
2000	7.48165
2005	9.16971
2010	10.12426
2015	9.84463
2020	12.14177
2025	13.61367
2030	16.96412
2035	19.85585
2040	20.31544
2045	21.36688
2050	22.44355
2055	23.89949
2060	25.27168
2065	26.50757
2070	27.33562
2075	28.15235
2080	29.14225
2085	30.22755
2090	31.23211
2095	32.01567
2100	32.57997