Year	Percent
1950	5.70792
1955	5.67302
1960	5.68943
1965	5.60301
1970	5.56669
1975	5.56902
1980	5.51803
1985	5.60955
1990	6.4825
1995	7.01919
2000	7.65568
2005	8.70373
2010	9.58285
2015	10.74433
2020	12.1806
2025	13.93728
2030	15.90874
2035	17.87724
2040	20.03792
2045	22.14545
2050	24.41754
2055	26.49118
2060	28.15223
2065	29.70998
2070	31.25064
2075	32.86998
2080	34.29968
2085	35.52179
2090	36.54556
2095	37.43185
2100	38.21334