I am working on eCommerce website.

Website have 6 root category pages, 22 sub category pages and 802 product pages.

All root category and sub category pages were indexed by Google. I checked my Google webmaster tools and It shows 160 URLs in web index.

Today, my website age is 1 Years, 1 Months and 9 days. I have generated XML sitemap and submitted to Google webmaster tools.

My main question is that, after 1 year only 160 URLs were indexed by Google.

I would like to increase these numbers and index maximum 80% URLs to Google. How can I get it done?