The candle market is an ever changing market in terms of fragranced candles. Not more then 5 years ago 2%-3% was considered a lot of fragrance. There are now candle companies adding 8%-10% to their candles and calling them super fragranced candles. In general, most candle companies are adding 4%-6% fragrance to their containers and votives. In pillars it runs around 3%-5%. 

However, we would also like to caution candle makers from relying totally on percentages. Scent companies offer different levels of concentration on the fragrances they sell. In instances where the concentration level of the fragrance is higher, you will be able to use less and still achieve the same smell from the candle.