Year	Percent
1950	19.36357
1955	18.35476
1960	18.42904
1965	16.57989
1970	14.72465
1975	13.63446
1980	12.48646
1985	12.19583
1990	12.02668
1995	12.22007
2000	10.5605
2005	9.90368
2010	8.80815
2015	8.23518
2020	7.89679
2025	7.62682
2030	7.25739
2035	6.81435
2040	6.38144
2045	6.0354
2050	5.79898
2055	5.64008
2060	5.48068
2065	5.28408
2070	5.07599
2075	4.89028
2080	4.76211
2085	4.67802
2090	4.61236
2095	4.55064
2100	4.47225