According to USPTO records from the T.E.S.S. database, the USPTO received 388,552 trademark applications in 2016*. This is a record for the number of US applications filed in a year. It also represents a jump of approximately 5% over the prior year. While this growth is slower than the prior year, it still is a record number. 2015 also appears to have been a record year for the number of registrations issued: 232,487.
In 2015, the USPTO saw approximately 378,000 new applications (in January 2016, my search found 370,271 but the number has likely increased due to some foreign filings and divided applications).
In 2014, the USPTO saw approximately 345,000 new applications (In January 2015, my search found 336,239 but the number showing 2014 filing date has likely increased due to some foreign filings and divided applications).
With the rate of growth in application filings and registrations issued, the USPTO trademark register indicates steady and increasing growth in the economy.
* Data from TESS search on January 6, 2017