Year	Percent
1950	12.04354
1955	11.97858
1960	13.16569
1965	14.08946
1970	14.18849
1975	12.80709
1980	11.99054
1985	11.13243
1990	10.68368
1995	10.94375
2000	10.29418
2005	8.71329
2010	6.96468
2015	5.26513
2020	5.60977
2025	5.44132
2030	5.38461
2035	5.1815
2040	4.79467
2045	4.43093
2050	4.31786
2055	4.39602
2060	4.45681
2065	4.42422
2070	4.30492
2075	4.17539
2080	4.12662
2085	4.18126
2090	4.27021
2095	4.31804
2100	4.28974