Table:
rank 2018
airport
total passengers
aircraft movements

2017
2018
change 2017 / 18
2017
2018
change 2017 / 18

1
london-heathrow
78,012,825
80,124,537
2.7%
475,783
477,604
0.4%

2
london-gatwick
45,556,899
46,086,089
1.2%
285,912
283,919
0.7%

3
manchester
27,826,054
28,292,797
1.2%
203,689
201,247
1.2%

4
london-stansted
25,904,450
27,996,116
8.1%
189,919
201,614
6.2%

5
london-luton
15,990,276
16,769,634
4.9%
133,743
136,511
2.1%

6
edinburgh
13,410,343
14,294,305
6.6%
128,675
130,016
1.0%

7
birmingham
12,990,303
12,457,051
4.1%
122,067
111,828
8.4%

8
glasgow
9,897,959
9,656,227
2.4%
102,766
97,157
5.5%

9
bristol
8,239,250
8,699,529
5.6%
76,199
72,927
4.3%

10
belfast-international
5,836,735
6,268,960
7.4%
58,152
60,541
4.1%

11
newcastle
5,300,274
5,334,095
0.6%
57,808
53,740
7.0%

12
liverpool
4,901,157
5,046,995
3.0%
56,643
59,320
4.7%

13
east midlands
4,878,781
4,873,831
0.1%
77,067
76,013
1.4%

14
london-city
4,530,439
4,820,292
6.4%
80,490
80,854
0.5%

15
leeds bradford
4,076,616
4,038,889
0.9%
46,159
38,680
16.2%

16
aberdeen
3,090,642
3,056,018
1.1%
97,007
91,279
5.9%

17
belfast-city
2,559,846
2,511,261
1.9%
36,332
35,959
1.0%

18
southampton
2,069,950
1,991,014
3.8%
44,161
39,651
10.2%

19
jersey
1,637,763
1,664,175
1.6%
46,615
42,436
9.0%

20
cardiff
1,465,227
1,581,131
7.9%
28,934
31,085
7.4%

21
london-southend
1,092,269
1,480,139
35.5%
26,674
32,531
22.0%

22
doncaster sheffield
1,355,559
1,222,347
8.5%
17,435
18,930
8.6%

23
exeter
908,750
931,265
2.5%
40,472
39,532
2.3%

24
inverness
874,934
894,360
2.2%
31,002
29,690
4.2%

25
guernsey
843,272
837,615
0.7%
38,209
36,356
4.8%

26
isle of man
797,615
836,656
4.9%
23,061
23,431
1.6%

27
glasgow-prestwick
696,309
681,715
2.1%
24,897
24,904
0.0%

28
bournemouth
694,660
674,972
2.8%
34,641
39,886
15.1%

29
norwich
528,153
536,578
1.6%
37,307
34,287
8.1%

30
newquay
461,300
456,888
1.0%
37,113
41,172
10.9%

31
sumburgh
256,418
245,868
4.1%
22,347
16,628
25.6%

32
humberside
190,936
192,526
0.8%
18,282
18,759
2.6%

33
city of derry
193,981
185,843
4.2%
5,156
6,330
22.8%

34
kirkwall
177,248
181,562
2.4%
14,754
14,771
0.1%

35
scatsta
170,847
174,934
2.4%
8,224
8,513
3.5%

36
durham tees valley
130,911
142,080
8.5%
19,668
16,950
13.8%

37
stornoway
134,148
135,700
1.2%
10,924
10,570
3.2%

38
st mary's
91,852
92,195
0.4%
11,357
12,546
10.5%

39
land's end
59,386
64,216
8.1%
10,062
11,511
14.4%

40
alderney
54,760
53,343
2.6%
9,707
8,981
7.5%

total
none
287,869,097
295,583,748
2.7%
2,789,413
2,768,659
0.7%

Statement: in 2018, cardiff airport was the 20th busiest airport in the uk.
Question: what was the rank of cardiff airport in 2018?
Answer: [20.0]