Year	Percent
1950	11.42736
1955	12.44432
1960	12.28934
1965	11.68769
1970	9.81646
1975	9.08628
1980	8.37805
1985	8.33681
1990	8.02684
1995	7.12804
2000	6.45469
2005	6.19697
2010	6.01979
2015	5.64445
2020	5.3155
2025	5.08679
2030	4.90764
2035	4.77245
2040	4.68891
2045	4.61439
2050	4.53293
2055	4.4597
2060	4.41023
2065	4.39342
2070	4.39653
2075	4.40001
2080	4.39819
2085	4.38942
2090	4.38443
2095	4.38908
2100	4.396