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# Check for equal slopes with Chi-Squared test

I have the following distribution of counts where blue represents blue shoes, red represents red shoes and green represents green shoes. Though the total sales numbers differ I want to check if the slopes of the three categories are the same over the years.:

I thought to compute a Chi-Squared Goodness of fit test for equal proportions but this seems to be not working since the values of the blue shoes are much higher than the other values.

Is there any possibility to check the slopoes using a Chi-Squared test (in Minitab/ Python)? If yes, how can I achieve the desired result? If not, what are my options?

Appreciate any help!!!