Add crowdedness data

lecture-data/crowdedness.txt

@@ -0,0 +1,61 @@
+Country	Crowdedness	fertility	GDP
+ARUBA	0.7	?	20100
+AUSTRIA	0.7	1.28	31187
+AZERBAIJAN	2.1	2.1	853
+BAHAMAS	1.3	2.29	14462
+BELGIUM	0.6	1.66	29257
+BERMUDA	0.6	1.67	51991
+BRAZIL	0.7	2.21	2700
+BULGARIA	1	1.1	2533
+CAMEROON	1.2	4.61	803
+CANADA	0.5	1.48	27097
+China_Macao	1.1	1.83	17007
+COLOMBIA	1.4	2.62	1744
+Costa_Rica	0.9	2.28	4189
+CROATIA	1.2	1.65	6398
+CUBA	1	1.55	2762
+CYPRUS	0.6	1.9	16038
+CZECH	1	1.9	8834
+EGYPT	1.3	3.29	1062
+FINLAND	0.8	1.73	31069
+FRANCE	0.7	1.89	29222
+French_Guiana	1.1	3.33	9705
+GAMBIA	1.5	4.7	224
+GERMANY	0.5	1.35	29137
+GUADELOUPE	0.9	2.1	14518
+GUINEA	0.8	2.88	424
+HONDURAS	2.2	3.72	980
+HUNGARY	0.8	1.2	8384
+INDIA	2.7	3.01	555
+IRAQ	1.5	4.77	594
+ISRAEL	1.2	2.7	18101
+JAPAN	0.8	1.32	33819
+Korea_Republic_of	1.1	2.02	11059
+KUWAIT	1.7	2.66	13641
+LESOTHO	2.1	3.84	594
+MARTINIQUE	0.9	1.9	14504
+MAURITIUS	1.2	1.95	4594
+NETHERLANDS	0.7	1.72	31759
+New_Caledonia	1.2	2.45	16751
+New_Zealand	0.5	2.01	19350
+NICARAGUA	2.6	3.75	750
+NORWAY	0.6	1.8	48881
+PAKISTAN	3	5.08	498
+PANAMA	1.6	2.7	3400
+PERU	2	2.86	2238
+POLAND	1	1.26	5355
+PORTUGAL	0.7	1.45	14645
+Puerto_Rico	0.7	1.89	20812
+REUNION	1	2.3	14614
+ROMANIA	1.3	1.32	2550
+San_Marino	0.7	?	38397
+Serbia_and_Montenegro	1.2	?	1843
+SLOVAKIA	1.2	1.28	6019
+Sri_Lanka	2.2	2.01	913
+SWEDEN	0.5	1.64	33925
+SWITZERLAND	0.6	1.41	43486
+SYRIA	2	3.32	1497
+TURKEY	1.3	2.43	3418
+United_Kingdom	0.5	1.6	30355
+United_States	0.5	2.11	36924
+URUGUAY	1	2.3	3274