Year	Percent
1950	6.94024
1955	6.32775
1960	5.42188
1965	4.55772
1970	3.9399
1975	3.44319
1980	3.19557
1985	3.16541
1990	3.40466
1995	3.49574
2000	3.73887
2005	4.00716
2010	4.32546
2015	4.52743
2020	4.82993
2025	5.48943
2030	6.28389
2035	7.13011
2040	8.11884
2045	9.18169
2050	10.53543
2055	12.29383
2060	13.93361
2065	15.29096
2070	16.73183
2075	18.32007
2080	19.98511
2085	21.61568
2090	23.15936
2095	24.63214
2100	26.06068