On: Military seizes control in Myanmar

[distances]

Your link shows GDP growth, which has been positive every year. So it has not dropped according to this data.

[jussij → distances]

If you look at the max data for that graph their GDP fell after 2008 and since then it has never returned to those higher levels of GDP.

At a glance it looks like their GDP went from around 12% down to 6.5% on average which is about a 50% drop in GDP.

It is also represents 12 consecutive years of GDP lower than that last 2008 peak.