I'm using Google Spreadsheets and currently, this is what I have in J2: =iferror(H2/G2,0)

I know I can double click the square in the bottom right and it will apply to every cell in the column but if I were to create a new row anywhere in the spreadsheet it would show up as empty. I just want every cell including Newly created cells to be filled with the formula above so it will display the correct data for that row. How do I do this?