From the personal experience (I was born in USSR in mid-70ies and have lived there since) 50% of the GDP should have been military expenses, including space program. Everyday life was more like to the poorest Latin America or African countries now, plus common shortage of anything but very basic food items. Even these were also often grown by people themselves. Common joke was following. Lecturer: "By 1980 Soviet Union will bypass USA economically". Student: "Better catch, but not to bypass". "Why not bypass?" Answer: "Then they would see that ass is naked".