Year	Percent
1950	13.69606
1955	15.84162
1960	15.3339
1965	14.41382
1970	14.1573
1975	12.50939
1980	9.69552
1985	10.01505
1990	10.79339
1995	8.90733
2000	9.2927
2005	9.06978
2010	8.21515
2015	7.68668
2020	7.37249
2025	7.06039
2030	6.66655
2035	6.24736
2040	5.90914
2045	5.67847
2050	5.54441
2055	5.44732
2060	5.34021
2065	5.21866
2070	5.1013
2075	5.0078
2080	4.95512
2085	4.91147
2090	4.87162
2095	4.82033
2100	4.77003