What was the increase / (decrease) in the Equivalent (Cdn$) between 2018 and November 2019?
{"2019 issuances -- April 30, 2019": {"Principal/ Notional amount (US$)": 1250.0, "Maturity date": 2049.0, "Coupon rate": 4.35, "Fixed hedged (Cdn$) interest rate 1": 4.173, "Equivalent (Cdn$)": 1676.0}, "2019 issuances -- November 12, 2019": {"Principal/ Notional amount (US$)": 1000.0, "Maturity date": 2049.0, "Coupon rate": 3.7, "Fixed hedged (Cdn$) interest rate 1": 3.996, "Equivalent (Cdn$)": 1308.0}, "2018 issuances -- February 8, 2018": {"Principal/ Notional amount (US$)": 750.0, "Maturity date": 2048.0, "Coupon rate": 4.3, "Fixed hedged (Cdn$) interest rate 1": 4.193, "Equivalent (Cdn$)": 938.0}}
equivalent_2019 = df["2019 issuances -- November 12, 2019"]["Equivalent (Cdn$)"]
equivalent_2018 = df["2018 issuances -- February 8, 2018"]["Equivalent (Cdn$)"]
answer = equivalent_2019 - equivalent_2018