Year	Percent
1950	15.45015
1955	19.14375
1960	19.49837
1965	19.25328
1970	17.96488
1975	16.6059
1980	15.97311
1985	15.58094
1990	13.72025
1995	12.31052
2000	10.67104
2005	10.11991
2010	9.80816
2015	9.93232
2020	9.04518
2025	8.192
2030	7.47581
2035	6.96441
2040	6.63578
2045	6.38697
2050	6.11684
2055	5.80606
2060	5.50564
2065	5.26954
2070	5.11494
2075	5.01712
2080	4.9334
2085	4.83198
2090	4.7241
2095	4.63059
2100	4.56878