Table:
average difference between the non-mortgage debt of families with positive expectations and that of other families
average non-mortgage debt

homeowners
renters
homeowners
renters

2016 dollars

all family units
6,836
2,020
22,338
9,135

age of major income earner

25 to 34
9,319
1,951
23,481
13,431

35 to 54
5,533
1,322
27,162
9,992

55 or older
8,707
2,598
16,521
4,464

education level of major income earner

high school or less
3,956
2,239
18,746
6,381

postsecondary education
5,781
1,221
23,129
10,674

university degree
9,748
1,798
26,522
13,888

immigration status of major income earner

landed immigrant
6,771
792
22,912
8,900

canadian-born
6,610
2,219
22,174
9,197

1999
5,505
2,389
13,896
7,836

2005
3,379
1,966
22,041
8,554

2016
10,376
1,859
29,088
10,728

Statement: data from 1999, 2005 and 2016 are pooled.
Question: list all years in which data are pooled.
Answer: [1999.0, 2005.0, 2016.0]