Year	Percent
1950	11.26116
1955	13.01348
1960	14.75559
1965	14.96463
1970	13.7703
1975	13.73178
1980	9.84901
1985	8.93296
1990	8.0282
1995	8.1029
2000	7.62318
2005	7.02914
2010	6.67342
2015	6.62966
2020	5.13365
2025	5.36738
2030	5.0923
2035	5.09366
2040	5.22341
2045	5.25806
2050	5.06741
2055	4.85638
2060	4.81445
2065	4.87681
2070	4.95078
2075	4.96865
2080	4.87857
2085	4.73026
2090	4.62402
2095	4.60377
2100	4.63639