Year	Percent
1950	12.63289
1955	13.0538
1960	16.29731
1965	17.79567
1970	18.65381
1975	17.45346
1980	17.39661
1985	19.33957
1990	18.94617
1995	16.04754
2000	11.92474
2005	9.11796
2010	8.493
2015	8.42161
2020	7.43483
2025	6.14885
2030	5.06491
2035	4.53514
2040	4.51829
2045	4.63834
2050	4.53637
2055	4.19731
2060	3.84961
2065	3.68619
2070	3.75039
2075	3.91816
2080	4.03871
2085	4.03974
2090	3.96993
2095	3.92667
2100	3.96319