Structural Vector Auto Regression and the Wholesale Price Per Gram of Cocaine

I have been working on another idea, a structural VAR model and the macroeconomic effects on the wholesale price per gram of cocaine. The data are from the DEA STRIDE from 1985 to 2009, prices per gram of cocaine are from undercover drug buys of four ounces or more. The exogenous variables are temperature from Colombia and the entire case count of the DEA of all substances. The Macroeconomic variables are the log difference of economic growth, the log difference of the Colombian exchange rate and the number of kilos sized by the DEA of trafficking quantities of cocaine (>500 grams). The constraints are that all of the variables can affect the price per gram and the economic growth rate in the United States can affect the Colombian exchange rate. After a headache getting my SVAR code to work I got the following Impulse response functions.