example query
/api/stats/pci?cube=trade_s_bol_m_sitc3&rca=Subnat%20Geography,Section,Trade+Value&Year=2017,2018,2019&method=subnational&cubeRight=trade_i_comtrade_a_sitc2_new&rcaRight=Reporter+Country,Section,Trade+Value&YearRight=2018&aliasRight=Country,Section
example query /api/stats/pci?cube=trade_s_bol_m_sitc3&rca=Subnat%20Geography,Section,Trade+Value&Year=2017,2018,2019&method=subnational&cubeRight=trade_i_comtrade_a_sitc2_new&rcaRight=Reporter+Country,Section,Trade+Value&YearRight=2018&aliasRight=Country,Section