Better check your source. The official source say in January, 2017, it was 62.9%. In March, 2018 it was 62.9%. The same. It was 62.7% in December, 2016, but not January.
https://data.bls.gov/timeseries/LNS11300000
Hey. More good job news. The labor force participation rate fell to 62.8%, lower than when Trump took office. https://data.bls.gov/timeseries/LNS11300000