Past Exchanges Exchange #1 (IPE 2009) Exchange #2 (IPE 2010) Exchange #3 (IPE 2011) Exchange #4 (IPE 2012) Exchange #5 (IPE 2013) Exchange #6 (IPE 2014) Exchange #7 (IPE 2015) Exchange #8 (IPE 2016) Exchange #9 (IPE 2017) Exchange #10 (IPE 2018)