Year	Percent
1950	16.03012
1955	17.37384
1960	17.01756
1965	16.53884
1970	16.04058
1975	15.61691
1980	15.08777
1985	14.04723
1990	12.53631
1995	11.34602
2000	10.86634
2005	9.96713
2010	9.21506
2015	8.95788
2020	7.88647
2025	7.40037
2030	6.92341
2035	6.52925
2040	6.18949
2045	5.91301
2050	5.65025
2055	5.40329
2060	5.19583
2065	5.05063
2070	4.94528
2075	4.8779
2080	4.80961
2085	4.74629
2090	4.68812
2095	4.65063
2100	4.6342