| Year | Value | | 2021 | 13,621,070,038.579 | | 2020 | 18,585,819,842.831 | | 2019 | 17,731,939,790.972 | | 2018 | 17,143,221,811.446 | | 2017 | 17,751,891,426.851 | | 2016 | 16,826,000,216.644 | | 2015 | 18,572,571,195.579 | | 2014 | 18,885,765,415.865 | | 2013 | 18,890,016,968.398 | | 2012 | 18,511,801,827.497 | | 2011 | 16,630,409,946.319 | | 2010 | 14,289,975,733.747 | | 2009 | 11,080,132,310.445 | | 1981 | 3,258,708,829.4229 | | 1980 | 3,395,346,424.3312 | | 1979 | 3,466,883,157.521 | | 1978 | 3,098,485,434.0119 | | 1977 | 2,767,233,660.4293 | | 1976 | 2,391,589,346.1409 | | 1975 | 2,217,265,482.9503 | | 1974 | 2,037,081,656.0308 | | 1973 | 1,643,170,738.2448 | | 1972 | 1,520,787,577.0825 | | 1971 | 1,744,091,423.9068 | | 1970 | 1,667,655,426.6053 |
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