Year	Percent
1950	16.50009
1955	14.36833
1960	16.53755
1965	16.43603
1970	16.34621
1975	16.05158
1980	15.56128
1985	15.84202
1990	16.15537
1995	15.57843
2000	15.60782
2005	16.25119
2010	16.61402
2015	16.74399
2020	16.57587
2025	16.35331
2030	16.15051
2035	15.86273
2040	15.48059
2045	15.02975
2050	14.50417
2055	13.92358
2060	13.3191
2065	12.70717
2070	12.10136
2075	11.48602
2080	10.93848
2085	10.38404
2090	9.88719
2095	9.42312
2100	8.98507