Year	constant 2015 US$
2012	3553.6571247517577
2013	3738.465633132298
2014	3828.7665336686578
2015	4125.870636080291
2016	4421.003222261257
2017	4461.710573581104
2018	4516.605999201029
2019	4599.617038475239
2020	4417.026397091496
2021	4933.073992382516