Year	Percent
1950	4.17375
1955	3.93507
1960	3.93058
1965	3.97204
1970	4.03785
1975	4.06407
1980	4.03757
1985	4.0004
1990	4.24549
1995	4.17774
2000	4.0539
2005	3.94089
2010	3.82681
2015	3.71439
2020	3.68416
2025	3.80173
2030	4.09744
2035	4.63848
2040	5.31912
2045	6.01349
2050	6.71384
2055	7.45348
2060	8.31699
2065	9.27345
2070	10.20315
2075	11.13366
2080	12.1194
2085	13.15459
2090	14.21569
2095	15.28015
2100	16.3433