Year	Percent
1950	13.36321
1955	14.84222
1960	13.24017
1965	12.1411
1970	11.63039
1975	10.37421
1980	9.71217
1985	9.35991
1990	8.53027
1995	7.81606
2000	6.55739
2005	5.86418
2010	5.30078
2015	5.43382
2020	5.39436
2025	5.19365
2030	4.88277
2035	4.59492
2040	4.46027
2045	4.48402
2050	4.56796
2055	4.60018
2060	4.54074
2065	4.45393
2070	4.41847
2075	4.46744
2080	4.56478
2085	4.63167
2090	4.64136
2095	4.59394
2100	4.54286