Year	% of GNI
1977	22.667645206213592
1978	22.24539041018587
1979	22.624813194634577
1980	26.790975869434824
1981	23.54399357067997
1982	19.777171563860875
1983	19.83621078890039
1984	18.6715540588802
1985	19.03944614167296
1986	18.71421069480559
1987	17.052833847936242
1988	17.387183673670183
1989	17.522889181057646
1990	13.513457398284004
1991	12.415891091538086
1992	15.151536581726349
1993	16.8228000293711
1994	15.901749072313791
1995	16.608413071573555
1996	16.086056908616516
1997	15.69766944225607
1998	15.916212998321617
1999	15.62435576401774
2000	17.611375139232077
2001	16.922328194391454
2002	19.610784558841665
2003	20.052285790197583
2004	20.12119019772991
2005	20.850320292028453
2006	22.225616121250088
2007	22.21185893827793
2008	22.290339777120266
2009	19.103125523448853
2010	20.147415595484304
2011	20.426828158290746
2012	19.01428519573465
2013	19.02432399365139
2014	20.032112275347533
2015	18.412668757757867
2016	18.96932328102524
2017	19.982284496032662
2018	19.51650564413999
2019	20.204935515414096
2020	20.227586147042604
2021	19.675372706916907