Djibouti has joined the PCT. This brings the number of members to 150. You can read about this here. Djibouti deposited its Instrument of Accession with WIPO on June 23, 2016. As a consequence, any PCT application filed on or after September 23, 2016 will automatically designate Djibouti.
The two-letter code for Djibouti is DJ.
Seeing the total now at 150 makes me think back to when I filed my first PCT application, in about 1986. At that point the PCT was about eight years old, and the number of member states was about forty. This graph shows the number of member states.