Table 3. LCA research rate for top 10 countries

No.	Country	Research ratio (%)
1	United States	15.25
2	China	14.79
3	Italy	10.21
4	Spain	8.32
5	United Kingdom	7.33
6	Germany	6.80
7	France	4.83
8	Canada	4.39
9	Sweden	4.22
10	Netherlands	3.89
11	Australia	3.62
12	Switzerland	3.56
13	Brazil	3.52
14	Denmark	3.44
15	India	3.02
16	Japan	2.64
17	Belgium	2.53
18	Portugal	2.34
19	Iran	2.04
20	Norway	1.90
21	Poland	1.70
22	South Korea	1.68
23	Finland	1.67
24	Malaysia	1.54
25	Turkey	1.36
26	Greece	1.31
27	Austria	1.28
28	Thailand	1.26
29	Hong Kong	0.93
30	Ireland	0.91