Add plot_impact_by_year
Add plot_impact_by_year

Tomyrusli/developing-data-products-shiny,zero323/developing-data-products-shiny,ajayrathi78/developing-data-products-shiny,juliocesarsolano/developing-data-products-shiny,lakshmananbabu/developing-data-products-shiny,zero323/developing-data-products-shiny,zero323/developing-data-products-shiny,Namoune/Developping-Data-Product-Coursera-Project,aboalyae/developing-data-products-shiny