Year	Percent
1950	17.73051
1955	19.34896
1960	19.12994
1965	18.69836
1970	18.56957
1975	18.90859
1980	16.60074
1985	14.78816
1990	13.83695
1995	12.89684
2000	12.04782
2005	11.14904
2010	10.01774
2015	9.40096
2020	8.62956
2025	7.89179
2030	7.22029
2035	6.67342
2040	6.23834
2045	5.90043
2050	5.61158
2055	5.3635
2060	5.13387
2065	4.96146
2070	4.82707
2075	4.73449
2080	4.66744
2085	4.61255
2090	4.57235
2095	4.54065
2100	4.52113