It is taking the Scottish Ambulance Service longer to dispatch vehicles across all categories of emergency, the statistics show.
So far this year, it has taken an average of 1 min 30 secs for an ambulance to be dispatched to a category A emergency, the most severe.
That compares to just 57 seconds in 2013/14.
Similarly, the average time for category B (2 mins 48 secs) and category C (4 mins 18 secs) incidents are getting worse.
Three years ago, the performance was 1 min 28 secs and 2 mins 18 secs respectively.
Last week, the ambulance service did state it was piloting a scheme to prioritise serious road accidents and cardiac arrests in a bid to address the problem.
As a result, those with less severe emergencies would be kept on the phone for longer in order to gain more assistance that way.
The data was obtained by the Scottish Conservatives through Freedom of Information.
Scottish Conservative community safety spokesman Oliver Mundell said:
"It's clear from these figures that there's been a major slip in performance with response times.
"They've got consistently worse, and this has to change as a matter of urgency.
"For every second that someone has to wait longer for an ambulance, their chances of recovery can worsen.
"I appreciate measures have been put in place to address this, but people will be sceptical about their impact.
"The Scottish Ambulance Service doesn't have its problems to seek, especially in rural areas.
"Sickness levels are too high, and those staff left over are too stretched as a result.
"The SNP has been in charge of this for almost a decade, and has to take full responsibility for these delays."