Some enterprising "Argonauts" set up businesses to furnish, feed, and entertain the region's growing population. Some merchants, gamblers, saloon keepers, "entertainers", hotel owners, restaurant owners etc. were as likely to prosper as the successful prospectors. The lack of money (specie) often meant that transactions and wages were paid in several different currencies or in gold dust. The population of San Francisco boomed as it was the main entry point for sea born travelers and goods of all kinds. San Francisco by 1850 was declared the main Port of entry in California for all imported goods. The federal government's got 91% of its income in 1850 from tariffs or custom duties of about 23% on foreign imports. By 1850 San Francisco had a population of about 20,000 (the largest city in California then) that had swelled to over 36,000 by the 1852 California Census. The population of California grew from 8,000 in 1846 to about 120,000 in 1850.