Year	Percent
1950	8.9563
1955	9.57791
1960	10.85128
1965	9.9444
1970	8.72614
1975	7.788
1980	8.49068
1985	8.95543
1990	8.09672
1995	7.31348
2000	6.3785
2005	5.02282
2010	4.57006
2015	4.93738
2020	4.97501
2025	4.89304
2030	4.70413
2035	4.41037
2040	4.18323
2045	4.1996
2050	4.37577
2055	4.51407
2060	4.54239
2065	4.49015
2070	4.42885
2075	4.44316
2080	4.5493
2085	4.67133
2090	4.73374
2095	4.70083
2100	4.62843