How to interprete variable coefficients of OLS where variables are expressed in first difference, I(1)?

I have estimated a multivariate regression line using OLS, and all 3 variables were found to be statistically significant.

$$d(NER)=.75+.08\times d(CA)+.002\times d(TB)-.003\times d(OFR)$$

Here, $NER=$ Nominal Exchange Rate (in No. of local currency exchange with $\$$1 USD),$CA=$Net Capital Inflows,$TB=$Trade Balance,$OFR=$Official reserve stock, and expressed in the regression in I(1) form, i.e.$d(NER)$,$d(CA)$,$d(TB)$and$d(OFR)$. I have confusion that how to interpret variable coefficients where those are expressed in first difference variables, i.e. I(1). How should I start with ... ? Either: • 1% change in net capital flows result 0.08% change in NER OR • 1 unit change in net capital flows result 0.08 change (in units) in NER Also, how can I interpret changes in first difference variable$CA, TB, OFR\$ ...??