Year	Percent
1950	18.05435
1955	18.72836
1960	18.58041
1965	17.93757
1970	13.95454
1975	11.45301
1980	11.27303
1985	10.27219
1990	9.29851
1995	9.83553
2000	8.31822
2005	7.77486
2010	6.47331
2015	5.47435
2020	5.19428
2025	5.16554
2030	5.17649
2035	5.02783
2040	4.76095
2045	4.50498
2050	4.3917
2055	4.44104
2060	4.53842
2065	4.57258
2070	4.52586
2075	4.45019
2080	4.42564
2085	4.48052
2090	4.57566
2095	4.64471
2100	4.66009