Year	current US$
1995	4011.3376618397497
1996	4376.624838807008
1997	4419.473110576086
1998	4735.0134701873185
1999	4265.56722440127
2000	3943.358173295091
2001	4265.195473702578
2002	5076.67741634806
2003	6414.896264947545
2004	7788.779501729498
2005	8699.733372131936
2006	9551.549684570158
2007	11429.31270194844
2008	13195.944739886767
2009	11560.027428131129
2010	11109.975745478949
2011	11677.725467624961
2012	10607.64293294793
2013	11207.391370291554
2014	11208.431819228887
2015	9996.732776988438
2016	10236.25831620624
2017	11349.110948819005
2018	12669.631862438308
2019	12740.008495652102
2020	11828.053956222824
2021	14553.484213577225