Zimmy.....The price of oil in mid-2014 was over $100 per barrel. With prices at that level, hydraulic fracking took off resulting in large supply increases. With OPEC unwilling to stabilize the supply of oil on world markets in 2015, the prices started plunging. By early 2016, oil was below $30. This meant many US frackers would produce less and the need for US pipelines would be diminished.
ET was under $5 per share when oil was under $30 in 2016.
Not surprising that when oil plunged below $30, ET went under $5 again in 2020.
McDee