Revise the following sentences to correct errors in writing numbers.
1. 60% percent of the respondents hope to hold internships before they graduate.
2. 1992 marked the formal beginning of the European Economic Community.
3. In the year two thousand, twenty percent of the H-1B visas for immigrants with high-tech skills went to Indians.
4. More than 70,000,000 working Americans lack an employer-sponsored retirement plan.
5. The company’s sales have risen to $16 million but it lost five million dollars.