Year	PPG (TDS, current US$)
2006	9259252.2
2007	4514050.9
2008	7292000
2009	9670000
2010	8675000
2011	9747904.9
2012	9913738.5
2013	11680274.6
2014	21248292.7
2015	27416416.2
2016	30269882.9
2017	30597878.7
2018	32675060.7
2019	32780041.6
2020	28700402.1
2021	19234000
2022	12017000