Year	Percent
1950	6.19182
1955	6.30422
1960	6.84872
1965	5.78537
1970	6.31878
1975	7.6693
1980	8.76439
1985	9.21608
1990	11.31446
1995	12.55382
2000	13.90947
2005	15.56653
2010	19.28323
2015	22.42362
2020	25.75113
2025	29.7636
2030	32.70478
2035	34.98259
2040	35.14663
2045	34.23353
2050	32.82867
2055	33.4282
2060	34.95731
2065	36.24468
2070	37.12112
2075	37.92852
2080	38.3602
2085	38.95643
2090	39.838
2095	40.59693
2100	41.01745