ATHENS, Sept. 7 (Xinhua) -- Greece's economy expanded 16.2 percent in the second quarter of 2021 year-on-year (y-o-y), the Hellenic Statistical Authority (ELSTAT) said in a provisional estimation Tuesday. As Greece emerged from its second COVID-19 lockdown, its economy also posted a 3.4 percent quarterly growth compared to the January to March 2021 period. After a 2.3 percent y-o-y contraction in the firs