Year	Percent
1950	4.76445
1955	4.47009
1960	4.14853
1965	4.11409
1970	4.16721
1975	4.28951
1980	4.45515
1985	4.73789
1990	5.51356
1995	5.75247
2000	6.1045
2005	6.65769
2010	7.11963
2015	8.55087
2020	10.30089
2025	11.99481
2030	13.85881
2035	16.21649
2040	19.00278
2045	22.19451
2050	25.38501
2055	28.29531
2060	30.83106
2065	33.00318
2070	35.07988
2075	36.87645
2080	38.3804
2085	39.54591
2090	40.43796
2095	41.12731
2100	41.68008