Year	Percent
1950	5.48693
1955	5.22368
1960	5.22702
1965	5.21646
1970	5.29191
1975	5.4566
1980	5.51997
1985	5.74307
1990	6.72159
1995	7.06775
2000	7.57798
2005	8.36105
2010	9.77967
2015	11.75835
2020	14.06176
2025	16.78694
2030	19.66001
2035	21.93818
2040	24.42195
2045	27.06651
2050	29.5396
2055	31.82361
2060	33.64985
2065	35.33333
2070	36.66989
2075	37.66645
2080	38.39282
2085	38.86998
2090	39.18229
2095	39.38986
2100	39.54326