Year % of GNI 1970 15.445288958179942 1971 20.442713416666667 1972 17.31522994801673 1973 16.254882220381116 1974 13.147155409824606 1975 11.027764847716687 1976 11.732944416935288 1977 19.62943956967215 1978 22.690660774634626 1979 17.970282796298005 1980 28.256491827504167 1981 27.577305097780112 1982 31.352187116072617 1983 33.685574604360916 1984 36.97680244282641 1985 39.60524270210155 1986 44.627216818433666 1987 48.10973649411267 1988 46.39216505794731 1989 39.67262704665154 1990 33.36137107557831 1991 34.28782832062988 1992 36.14379217139908 1993 38.61402151642913 1994 52.00605751415098 1995 44.41494876548009 1996 45.15845508563434 1997 45.33757021700465 1998 35.51979646886483 1999 40.25340045674906 2000 43.212140269656125 2001 57.405095004061344 2002 55.90193820618128 2003 48.006555530626414 2004 41.03437956088692 2005 35.58413150544531 2006 39.47499966268798 2007 39.803993491360195 2008 38.59837097659628 2009 44.57378835500729 2010 41.10010006063696 2011 38.6015945472714 2012 40.43599062455181 2013 42.37166945451061 2014 44.473405638535674 2015 46.75478922816808 2016 46.37597262583639 2017 52.69330828786543 2018 55.447412949107935 2019 55.3444481657992 2020 60.33159574397406 2021 54.06758439835673 2022 51.04899966240144