Year	Percent
1950	9.8845
1955	9.44569
1960	16.74933
1965	15.95237
1970	17.24189
1975	16.97759
1980	16.26871
1985	15.47521
1990	16.23246
1995	16.52623
2000	15.23728
2005	13.00255
2010	11.37042
2015	10.50938
2020	9.69391
2025	9.22174
2030	8.6006
2035	7.90312
2040	7.27212
2045	6.77198
2050	6.39187
2055	6.09734
2060	5.84081
2065	5.61681
2070	5.42442
2075	5.26835
2080	5.15567
2085	5.07893
2090	5.01015
2095	4.95167
2100	4.8972