Year	Percent
1950	12.55999
1955	12.57703
1960	13.58911
1965	13.84343
1970	14.73097
1975	16.02793
1980	16.27301
1985	15.24216
1990	13.93818
1995	12.9781
2000	11.21325
2005	9.81558
2010	9.24135
2015	9.5665
2020	9.41742
2025	8.37426
2030	7.47474
2035	6.74591
2040	6.31536
2045	6.15569
2050	6.0964
2055	5.95869
2060	5.7174
2065	5.46205
2070	5.30066
2075	5.24837
2080	5.25554
2085	5.24772
2090	5.18583
2095	5.08324
2100	5.00116