Year	Percent
1950	8.02253
1955	9.20357
1960	10.26559
1965	9.52738
1970	7.11431
1975	9.29612
1980	8.85807
1985	8.78214
1990	7.55565
1995	7.63607
2000	5.61413
2005	5.18691
2010	5.1501
2015	5.27566
2020	4.96897
2025	4.86421
2030	4.76081
2035	4.6654
2040	4.64901
2045	4.70852
2050	4.73344
2055	4.71215
2060	4.69672
2065	4.69878
2070	4.72949
2075	4.77397
2080	4.81002
2085	4.8097
2090	4.78784
2095	4.7584
2100	4.74774