Q1 (sorted from highest to lowest)

Vietnam :  +3.82%  (10-year low)
Indonesia : +2.97%    (weakest since 2001)
Malaysia : +0.7%    (weakest since 3Q 2009 )
Philippines : -0.2%      (first time negative in 22 years)
South Korea : -1.4% (biggest decline since 4Q 2008)
UK : -2.0%
Thailand : -1.8% (the deepest contraction since the flood-hit fourth quarter of 2011)
Singapore :  -2.2%    (worst GDP year-on-year contraction since 1Q 2009)
US : -4.8%  (lowest level since the 8.4% plunge in Q4 of 2008)
China : -6.8%      (first decline since at least 1992, when official quarterly GDP records started)
Hong Kong : -8.9%    (biggest fall since the government began tracking comparable data in 1974)

Q2

China : +3.2%    
Vietnam : +0.32%    
South Korea :  -3.3%   (worst GDP contraction South Korea has experienced since 1998.)
Indonesia :    -5.32%   (the lowest since the first quarter of 1999)
Hong Kong : -9.0% (contracted for the fourth straight quarter, only one quarter behind the longest recession on record, when Hong Kong's economy shrank for five quarters in 1998-1999.)
US : -9.5%  (steepest decline in nearly 70 years of quarterly data)
Singapore :  -13.2%    (worst on record)
Phillipines :  -16.5%  (lowest since 1981)
Malaysia :  -17.1%  (worst performance in nearly 22 years)
UK : -20.4% ( worst on record )
Q1 Sos

MY : https://www.theedgemarkets.com/article/bnm-...measures-impact
SG : https://www.channelnewsasia.com/news/busine...vid-19-12577146
HK : https://www.thestar.com.my/news/regional/20...as-gdp-dives-89
SK : https://pulsenews.co.kr/view.php?year=2020&no=421550
PH : https://www.rappler.com/business/260156-gro...ippines-q1-2020
ID : https://www.channelnewsasia.com/news/asia/i...e-2001-12703550
CN : https://www.cnbc.com/2020/04/17/china-econo...oronavirus.html
US : https://www.cnbc.com/2020/04/29/us-gdp-q1-2...st-reading.html
TH : https://www.bangkokpost.com/business/192140...y-rate-to-0-50-
VN : https://vietnamtimes.org.vn/vietnams-gdp-gr...-low-18849.html
UK : https://www.theguardian.com/business/live/2...n-business-live

Q2 Sos

MY : https://www.straitstimes.com/asia/se-asia/m...omic-activities
SG: https://www.straitstimes.com/business/econo...nges-worse-than
ID : https://www.thejakartapost.com/news/2020/08...5-32-in-q2.html
VN : http://hanoitimes.vn/vietnam-positive-grow...sbc-313035.html
CN : https://news.cgtn.com/news/2020-07-16/China...gOrK/index.html
US : https://wolfstreet.com/2020/07/30/no-gdp-di...l-annual-rates/
SK : https://asiatimes.com/2020/07/south-koreas-...nges-3-3-in-q2/
PH : https://thefinancialexpress.com.bd/economy/...1981-1596690529
HK : https://www.straitstimes.com/business/econo...shrinks-9-in-q2
UK : https://www.cnbc.com/2020/08/12/uk-gdp-plun...nd-quarter.html

Anyone want me to add other countries to the list, can help give me sos

All numbers here are compared to same quarter last year (Year on Year comparison)

But you find any mistake, you can point it out.