Year GDPP current USD GDPP current PPP dollar Market Exchange rate PPP-based Exchange rate 2009 1,217.2686 5,024.1221 17,065.0833 4,134.6109 2010 1,673.3293 5,357.2430 18,612.9167 5,813.7252 2011 (1) 5,759.9113 20,509.7500 6,915.3354 2012 2,178.0432 (2) 20,828.0000 7,167.0566 2013 2,354.8741 6,688.7743 (3) 7,369.8945 2014 2,545.4168 7,202.9242 21,148.0000 (4) 2015 2,581.6224 7,555.8458 21,697.5675 7,413.4556 2016 2,745.5656 8,232.2541 21,935.0008 7,315.6128 2017 2,974.1172 8,996.3781 22,370.0867 7,395.3384 2018 3,230.9277 9,776.8195 22,602.0500 7,469.2582 2019 3,425.0893 10,561.9713 23,050.2417 7,474.8485 2020 3,526.2746 10,904.4521 23,208.3683 7,505.1069 2021 3,694.0190 11,553.0699 23,159.7826 7,405.1900 The above table presents data on the macroeconomic variables relating to the compilation of the Vietnam's GDP and PPP-based GDP.a) The number to be filled in blank cell number (1) is .. b) The number to be filled in blank cell number (2) is ...... c) The number to be filled in blank cell number (3) is .......... d) The number to be filled in blank cell number (4) is f) Explain why PPP-based GDP measure is a better gauge in comparing income across countries