Incidence of GMO corn, cotton and soy updated

As of July 2018 the average incidence of food crops grown in the US.

Corn:
All GE varieties: 92%

• Herbicide tolerant only: 10%
• Produces Bt (insect resistant): 2%
• Stacked gene: 80%

Soy:
All GE varieties: 94%

• Herbicide tolerant only: 94%

Source: USDA.gov.

El Salvador bans Roundup and gets record harvest!

1. In September 2013, El Salvador passed a ban on 53 crop protection products for agricultural use. Among them, the large coffee, cotton, maize and sugarcane producing country was pulling off Roundup (glyphosate), a Monsanto star herbicide, recently listed as a "probable carcinogen" by the World Health Organization (WHO).
2. GMO seeds cannot be saved from old crops, they must be purchased every year, leading to an increased cost for the farmers.
3. The GMO seeds were not adapted to the locality. 
4. They are using H-29 maize instead.

Source

Link in French.
Link in English via Google Translate.

China rejects tons of GMO corn

This is from 2014, but I list it just for the "hmmmm".

[SANTIAGO] China’s rejection on March 24 of 21,800 tonnes of US corn containing an unapproved genetically-modified organisms (GMO) strain takes the volume of US corn turned away by the Asian nation since November to 908,800 tonnes. The contamination detected by the Chinese has hit sales and corn prices, damaging US farmers growing GM-free crops.

Source
GMO Journal.

Which GMO crops are grown in the US?

As of 2015, over 90% of corn, soybean and cotton crops grown in the US are GMO crops. Corn and soybean make it into the food supply, and there is no consensus among scientists regarding the safety of foods that are Roundup Ready or that contain the Bt Crytoxin.

GMO crops in the US below through 2012.

GMO crops 2000-2012. From MotherJones.com