Year	Percent
1950	4.74608
1955	4.73926
1960	4.88455
1965	5.01577
1970	5.00033
1975	4.68117
1980	4.01315
1985	3.4383
1990	3.53247
1995	3.32126
2000	3.97969
2005	4.10936
2010	3.89856
2015	3.84296
2020	4.22625
2025	5.50321
2030	7.1482
2035	9.63783
2040	12.60138
2045	16.09356
2050	20.31932
2055	24.30311
2060	27.35238
2065	29.64331
2070	32.08435
2075	34.68251
2080	36.74808
2085	37.75233
2090	37.94142
2095	37.87444
2100	37.86858